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Maternal perceptions of childhood vaccination: explanations of reasons for and against vaccination

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Abstract

Background

Understanding reasons for and against vaccination from the parental perspective is critical for designing vaccination campaigns and informing other interventions to increase vaccination uptake in Canada. The objective of this study was to understand maternal vaccination decision making for children.

Methods

Mothers participating in a longitudinal community-based pregnancy cohort, the All Our Babies study in Calgary, Alberta, completed open-ended survey questions providing explanations for the vaccination status of their child by 24 months postpartum. Qualitative responses were linked to administrative vaccination records to examine survey responses and recorded child vaccination status.

Results

There were 1560 open-ended responses available; 89% (n = 1391) provided explanations for vaccinating their children, 5% (n = 79) provided explanations for not vaccinating/delaying, and 6% (n = 90) provided explanations for both. Themes were similar for those vaccinating and not vaccinating/delaying; however, interpretations were different. Two broad themes were identified: Sources of influence and Deliberative Processes. Sources of influence on decision making included personal, family, and external experiences. Deliberative Processes included risk, research, effectiveness, and balancing risks/benefits. Under Deliberative Processes, responsibility was a category for those vaccinating; while choice, instrumental/practical, and health issues were categories for those not vaccinating/delaying. Mothers’ levels of conviction and motivation provided a Context for understanding their decision making perspectives.

Conclusions

Vaccination decision making is complex and impacted by many factors that are similar but contribute to different decisions depending on mothers’ perspectives. The results of this study indicate the need to examine new intervention approaches to increase uptake that recognize and address feelings of pressure and parental commitment to choice.

Introduction

Vaccination contributes to significant reductions in communicable disease [1]. However, declining vaccination rates may be due to parental concerns resulting in increases in preventable disease [2]. Vaccination decision making is not simply a matter of two opposing viewpoints, but includes a spectrum from complete refusal to confident acceptance [3]. Parental vaccination decision making involves cognitive, psychosocial, and political factors influenced by current scientific, cultural, and media environments [4]. There continues to be a knowledge gap in how to best increase vaccination rates.

Currently, recommended childhood vaccinations in Alberta, Canada are not mandatory for school entry [5]. Parents may choose to vaccinate their child or not as they prefer. Vaccinations are publicly-funded requiring no personal payment nor health insurance. Public health nurses provide vaccinations in community-based clinics throughout the province, for example, the City of Calgary has 8 clinics covering all four quadrants of the city with 12 additional clinics in the communities surrounding Calgary [6]. Clinic hours cover week days and some evenings. Therefore, direct costs are not a barrier in Alberta to childhood vaccination. An understanding of the complex factors contributing to parental decision making is critical for designing and informing interventions to increase vaccination uptake.

The research question that guided this study was how do mothers explain their decisions to vaccinate, not vaccinate, or not fully vaccinate their children with the objective of understanding maternal vaccination decision making for infants up to 24 months.

Methods

Survey data was obtained from the All Our Babies study (AOB), an ongoing longitudinal pregnancy cohort study in Calgary, Alberta [7]. Women were recruited in the second trimester of pregnancy when they provided written informed consent and completed mailed questionnaires during pregnancy and at 4, 12, 24, and 36 months postpartum. The AOB 24 month questionnaire, which was used for analysis, included both closed and open-ended questions on a variety of health topics, including childhood vaccinations.

We analysed mothers’ narrative responses to two questions related to routine childhood vaccinations. The first question asked “if your child has NOT received any or all of the vaccinations listed above, for what reason(s) did you NOT immunize your child?” The second question asked “if your child has received any or all of the vaccinations listed above, for what reason(s) did you immunize your child?” Qualitative inductive content analysis was used to develop codes, categories, and themes from the text responses [8]. We chose to bracket any theoretical frameworks or concepts related to parental immunization decision making during the analysis phase to mitigate preconceived notions and privilege participant voices and perspectives [9]. Initial codes were developed by one member of the research team (MM) guided by DM and further developed with two other investigators (VS, SM). These were then shared with the remaining team for verification. Over the course of several meetings of the full research team (n = 7) all members contributed to re-coding and theme development. Using an Excel spreadsheet, comparisons across sub-themes and themes were made to identify similarities and differences. Analysis continued until no new themes emerged. The research team consists of scientists, registered nurses (DAM, SM) and a physician (JDK) with a background in public health and immunization. DM and ST have experience in conducting qualitative studies including content analysis and phenomenology. The research team are interested in better understanding how immunization rates can be improved.

In analysing the data we were struck by the narrative of some parents that seemed to indicate a strong conviction and in others a limited conviction in their responses. As well, we also noted what seemed to be responses that indicated intrinsic or extrinsic motivation. Thus we quantified this data by developing definitions for conviction and motivation and then two team members (MM and DM) independently categorized responses and reached consensus for differences in ratings for both conviction and motivation. This analysis was done to provide context and background for the more inductive qualitative analysis.

Analysis was completed based on response to the questions posed in the survey to maintain integrity between questions and responses and to avoid oversimplified categorizations of parents. To verify vaccination status, the AOB survey data was linked to Calgary Zone Public Health administrative databases using unique public health numbers for those who completed the survey and agreed to linkage. However, a large proportion (n = 218, 14%) was not able to be linked. Ethics approval was obtained from the University of Calgary Conjoint Research Ethics Board (ID: REB14–0925).

Results

Participants

Narrative responses were available from 1560 (74%) of 2114 women eligible for the two year follow up survey (see Fig. 1). See Table 1 for participants’ socio-demographics at two years post-delivery. Of the 1560 women who responded, 1391(89%) provided explanations for vaccinating their children, 79(5%) for not vaccinating/delaying, and 90(6%) for both questions. We linked 1342 (86%) responses with administrative data to identify vaccination status; we were unable to link 218(24%) due to missing public health numbers. The majority (73%) of children completed all vaccinations by 24 months, 12% received some, and 1% received no vaccines (Table 2). Of the 79 women who explained why they did not or delayed vaccinating their children, 22% were partially or completely vaccinated.

Fig. 1
figure1

Participant flow chart

Table 1 Descriptive information of the participants who completed the qualitative responses in the two year follow up survey (n = 1560)
Table 2 Vaccination status of child, according to vaccination registry, by mother’s response to the question of why vaccinated, why didn’t vaccinate, or if responded to both questions

Themes

Two broad themes arose from sub-themes and categories (Fig. 2 and Table 3). The first theme, Sources of influence were those factors with potential to sway decision making. The second theme Deliberative Processes describes reasoning that went into the decision. We also identified that many parent responses reflected a high level of conviction and in others a high level of internal motivation for which we created operational definitions (see Table 4) and then categorized. These categorizations provide background context for understanding responses focused on the respondents’ internal deliberative processes. Level of conviction was reflected in certainty or uncertainty in response(s) and motivation conveyed how much decisions were internally or externally driven. For exemplars of themes see Tables 5 and 6.

Fig. 2
figure2

Visual model of themes extracted from participant responses

Table 3 Themes derived from participant responses
Table 4 Categories of parent conviction and motivation in statement about vaccination
Table 5 Why Vaccinate Themes and Exemplars
Table 6 Why Not Vaccinate Themes and Exemplars

Sources of influence

Vaccination decision making was influenced by personal, family or others’ experiences, i.e. generally a recall of reactions to vaccination or others’ perspectives on vaccinating, and external sources, such as health professionals or institutions. However, conclusions from those experiences and external sources varied depending on the type of experience and vaccination stance. For example, personal/family experience of those describing their decision to not vaccinate/delay typically referred to an experience that the mother or father had, as exemplified by a participant: “cause my brother died due to a reaction of vaccine and my dad in-law is alargic [sic] to eggs.” Another participant said “My mother very anti-vaccine- hard to get an appt. w/o her knowing.” On the contrary, personal and family experiences of those describing their decision to vaccinate was interpreted positively as seen in the following statements by two different mothers: “because both myself and oldest son have had them.” “My mum is a nurse and she’s big on vaccinations. I’m not 100% sure, but we did it to keep them safe.”

Some mothers experienced a feeling of pressure attributed to external sources. For example, those who chose not to vaccinate/delay were influenced by a doctor, nurse, naturopath, or pediatric infectious disease specialist with whom they discussed vaccinations. One respondent indicated their decision resulted from a “Recommendation by naturopath to delay until 2 years if possible unless travelling. He stays at home and is not exposed to sick kids.” Of note, another respondent said “The larger number of vaccines some of which are unnecessary (according to every medical doctor I’ve spoken to), the manner in which they are bundled and the fact that some contain monkey RNA and other foreign chemicals concerns me greatly in terms of my children’s immune systems.” Some participants experienced pressure to vaccinate their children, which resulted in discontinuing as the following exemplar indicates: “Decided not to continue. Felt pressured to do first 3 imm. but not anymore…!” In contrast, a participant whose decision was to vaccinate stated, “I was skeptical about immunizations but in the end decided to do it, mostly because of pressure from doctors and health nurses.” Many participants, who vaccinated, thought it was a requirement for either pre-school, day home, or the health authority.

Trust, a category of external Sources of influence for both decision making choices, varied by perspective. Lack of trust was evident in the following exemplar: there was a “…lack of ingredient and reaction reports released to the public. The vaccine companies are heavily protected by gov’t.” In contrast, another mother, indicated trust in the system, stating “Because I trust Canada Health and the World Health Org.”

For those who chose to vaccinate their children, additional external influencing categories included social norms and opportunity. Vaccinating was considered routine, regular, common sense, or standard by “following the norm of society.” Along the same lines, a category of opportunity emerged in which participants reported that vaccinations were available and “Immunizes [sic] are important and we are lucky to have them provided to us in this country.”

Deliberative processes

Mothers’ contemplated many factors and had to balance positive and negative perceptions. The perception of risks of vaccines and health and illness consequences of vaccinating or not were considered no matter the vaccination stance but conclusions drawn contrasted. For those who chose not to vaccinate/delay, there was a belief that vaccines were “unnecessary”; the child would be “healthier without them”; and that their children’s “immune system needs a chance to mature” and “get natural immunity.” In contrast, those who chose to vaccinate, felt it was “necessary,” as one respondent stated “to keep my child healthy.” Further, as one parent stated, “immunizations are important for children’s immune systems.” Travel was a factor for those stating why they vaccinated as one mother noted “when living in a multicultural society with so much travel it only makes sense.”

There were also contrasting views on the safety of vaccines. Some opposed to vaccination were “not comfortable with ingredients used in vaccines,” as one mother stated, “They’re toxic. I love my child.” Another concern regarding safety was the number of shots required as noted by one mother who stated “we don’t want to overload her system with too many vaccines.” In contrast, those in support of vaccines perceived them to be safe as one mother said “I think it will give me peace of mind,” another mother stated “…it’s better to have a safety net.”

Statements indicated research was done by parents to inform decision-making; however, each perspective lead to different conclusions based on how parents interpreted their own research or others’ research. Those opposing vaccines had a “Fear of possible link to autism/other diseases”; “we have done lots of research and vaccinating is not for our family” or made comments such as “While there isn’t conclusive proof that vaccinations are harmful, there are too many correlations to allergies and diseases for me to be comfortable.” Those in favor of vaccinating stated “Because it’s smart. Science… inconclusive about autism… Did much research.”

Those opposing vaccination had concerns with vaccine effectiveness, as one respondent indicated, “I feel there’s not enough research on them.” Those in favor identified vaccinations as “…an effective way of preventing disease” as well as reasoned that “…these illness are now rare due to the fact that we now have vaccinations.”

Balancing the benefits and the risks was a sub-theme evident in both perspectives. Those opposed to vaccination considered the likelihood of contracting diseases to be low and there was potential for more harm than good; their explanation was that “the risks outweigh the benefits” as one mother stated. Those in favor of vaccination were convinced that there was the potential for more good than harm, as one mom stated “because we value health and wellness, risk of not vaccinating is not an option in our home.”

The sub-theme of responsibility was only observed among those who were strongly in favor of vaccinations and either felt a “parental responsibility” or a “public health duty” and to “be a responsible member of society.” They also felt they “potentially contribute to eradication of disease.”

The sub-theme of choice was only observed among those indicating no/delayed vaccination. A mother stated that “I chose not to have the live vaccine at this time.” Often the personal choice comments did not indicate an explanation merely stating that it was “…MY CHOICE.”

The sub-theme of instrumental or practical reasons was evidenced by a number of parents indicating that their child’s vaccination was delayed/incomplete and made comments such as “will get them done, just haven’t yet”, with no other indication that vaccinating was unacceptable. While others identified practical issues like “too hard to fit in when working.” Another practical issue was clinics being very busy and “backed up” leading to delay. The sub-theme of health issues arose from mothers who indicated they would vaccinate when “no longer breast feeding” or when their child “put on more weight.”

Context

A mother’s level of conviction and motivation was considered as context in which explanations were provided (see Table 4). Approximately 40% of participant responses conveyed a sense of either intrinsic or extrinsic motivation regardless of their decision. There were a greater proportion of ‘Why Not vaccinate’ respondents who we interpreted as being externally motivated (61%), consistent with theories of social network influences on those who are vaccine hesitant [18]. For those who chose to delay/not vaccinate, statements such as “We wanted to wait until she was older to do her vaccinations” and “Because I did not want to” demonstrate intrinsic motivation. While statements such as “Recommendation by naturopath to delay…” and “We are delaying immunizations – our family (extended) is completely against them” show how external sources influenced motivation not to vaccinate. There were also examples of both internal and external motivation for those who responded ‘why vaccinate’, for example “I didn’t really think twice about it. I’d already made up my mind to do it” contrasting with “…as suggested by community health.”

For some mothers (~ 50%), a strong level of conviction was evidenced regardless of vaccination decision while the remainder of the sample responses lacked evidence of strong conviction. There were a greater proportion of ‘Why Not vaccinate’ respondents who we interpreted as having strong conviction (54%). One mother who indicated a strong conviction against vaccinating stated “Decided not to continue…It’s MY CHOICE.” Others indicated ambivalence, “Not sure who to believe…” and “He has had them all but I am not a believer that it is a good thing.” A mother in support of vaccinating who showed conviction stated “I strongly believe in it…” while ambiguity can be observed when a mother said “because it’s a good idea, even though I don’t like it.”

Discussion

Our analysis and results provide a detailed description that contributes to an understanding of maternal vaccination decision making and can provide guidance to decision makers on approaches to take when designing interventions to increase vaccination uptake. Our study highlights the dynamic nature and multilayered factors that contribute to parental decision making [10, 11]. Across both major themes (Sources of Influence and Deliberative Processes), many sub-themes were the same regardless of the mother’s vaccination decision; however, interpretation was different. A few sub-themes (responsibility, choice, instrumental/practical, and health issues) were unique to the particular decision making perspective. We did not explicitly set out to study vaccine hesitancy. However, our findings include certain elements found in existing hesitancy frameworks. For instance, the range of parental responses are similar to those described by Leask as spanning from refuser to confident acceptor [12]. As Gowda and Dempsey identify, even those parents whose children are fully immunized have concerns, and these were evident in our results [13].

Those who had timely completion of vaccination for their children were positively influenced by their personal experiences or experiences of their family, similar to other studies [14,15,16,17]. These explanations are consistent with existing child care decision making frameworks [10], as well as vaccine decision making frameworks [18, 19]; in which social networks are seen as sources of influence in decision making and thought to be an avenue for interventions. Basing decisions on personal experience is also consistent with psychological decision making frameworks contending that perceptions and judgements, particularly in situations of uncertainty, are more likely influenced by information that is familiar, salient and recent [10]. Information from health care providers created the impetus, and in some, the feeling of pressure to complete vaccinations. The idea of conformity [20] or feeling pressure [21] has been previously described. Similar to findings by Tickner et al. and Wilson et al., vaccination was considered part of the social norm or was thought to be a requirement for day care or school attendance, although this is not true in Alberta [16, 17]. We identified vaccination contributed to peace of mind, which is a new explanation for vaccinating as far as we are aware. Similar to the findings of Tickner et al. and others [12, 16, 19], it was not only a personal but also societal responsibility.

The reasons, for those responding to ‘Why Not vaccinate’, included negative experience with vaccination or lack of impact of vaccination as a reason for their decision; a finding consistent with past research [14, 16, 17, 21, 22]. Similar to previous studies, we found that when parents received information from health care professionals that supported their own negative views or pressure they experienced to vaccinate, this contributed to them deciding to not/delay vaccinating their children [17, 20]. This highlights the phenomenon of parents choosing health care providers who have consistent views with their own [23]. Busse et al. found parents wanted unbiased or neutral information from physicians [21]. This finding reinforces the need to address health care provider doubts and knowledge gaps because of the influence they wield [21].

Some parents in our study perceived that risks outweighed benefits and that their children would be healthier without being vaccinated [14, 17, 24, 25]. Others expressed concern regarding the ingredients of vaccines and a fear of autism, which has been cited in a number of previous studies [14, 16, 22, 24, 26, 27]. Prospect theory provides an understanding indicating that fear of loss or harm creates more intense responses; and supports our results regarding level of conviction, with more parents responding to Why Not vaccinate with conviction [10]. We identified a lack of trust in health systems/the government and organizations; a common theme in other research [14, 16, 20, 24,25,26, 28, 29]. In contrast, those who responded ‘why they vaccinated’ expressed trust in the government, the system, and their health care provider. Vaccine effectiveness was questioned by parents, as has been previously identified [17, 22]. It is important to note that personal choice was only used as a reason for those responding Why Not Vaccinate and indicates that pressure tactic types of vaccination campaigns can have an opposite impact for some parents. Other research has not focused on personal choice as a key theme but on religious [14, 25, 29] or ethical beliefs [24] influencing decision making. Practical considerations were cited by parents who had delayed, such as difficulty taking time off work for appointments, similar to two previous studies [16, 29]. For those parents who indicated they were delayed without providing any rationale, it is unclear why they did not prioritize vaccination. It was unclear whether this pertained to their perspective of vaccination i.e. acceptance, or if the reasons were more practical in nature.

Analogous to our study, previous qualitative and quantitative studies on parental perspectives included parents who had fully immunized as well as parents whose children were partially or not immunized [14, 15, 17, 20, 21, 25, 27]. Parents from each perspective reported doing research on their own, as Tickner et al. found, for those who chose to vaccinate and others have found for those who chose not to vaccinate [16, 22, 24, 26, 28,29,30]. Contrary to other studies, parents responding both Why and Why Not vaccinate in our study did not describe needing more information; [16, 31] they researched on their own but a few in each group identified the need for more research/studies to be conducted. The use of the internet for “research” to support decision making is concerning as non-medical websites include inaccuracies, rumors, and myths that contribute to fear and hesitancy [16]. The participants described by Luthy et al. as being anxious about vaccination may be similar to our participants who responded to both questions in the survey i.e. describing why they vaccinated and why they did not [24].

Strengths and limitations

This study’s strengths include a large sample for a qualitative analysis, although our findings may not differ from others they confirm those findings in a large and robust data set.. Close to 75% of the eligible study population responded and 98% of those who completed the survey answered the vaccination questions. The sample demographics were consistent with those of the urban center from which the sample was recruited, and the data were collected concurrently with the vaccination timeframe, reducing the potential for recall bias. Multiple investigators read the participant responses and corroborated the themes and sub-themes in an iterative fashion for accuracy of interpretation. Novel to this study, the survey questions asked about both perspectives of vaccination allowing for the analysis to include explanations for both types of decisions, and enabling participants to communicate if they did not feel strongly about just one perspective. Other studies [15] classify parents into categories based on vaccination decision; conversely, this study did not label parents but instead created a visual representation of their feelings, opinions, and explanations for or against childhood vaccination in order not to set up opposing “sides” or create labels.

The results of this study reflect a homogenous sample of well educated, higher income mothers and thus may not be applicable to others with different demographics or contexts. Data were comprised of text responses to a survey thus there was no opportunity to probe responses to gain a more in-depth understanding of the vaccination perspectives. The quantification of motivation and level of conviction that provided context for the analysis was limited by the authors’ interpretations without being able to further explore or test the assumptions made in the categorizations and thus need to be interpreted with caution.

Implications and future research

Based on our findings, confirming previously identified issues with vaccination, we propose two strategies to combat vaccine hesitancy. The first is to examine the usefulness of motivational interviewing. Health professionals are often the first point of contact for vaccinations and are integral to implementing strategies for increasing vaccination uptake [12]. Motivational interviewing could be used to address the feelings of pressure experienced by parents and the voiced commitment to parental choice that our results identify. Parents might feel more understood [20] and the conversation less likely to contribute to negative and lasting parent impressions.

The second strategy would be to explore use of storybooks to target parental attitudes towards childhood vaccination. This technique has been used with parental attitudes towards children’s oral health behavior and found to be effective [32]. The premise is that the story is written for children but subtly gets parents to think about their attitudes towards the subject. An example could be the use of a plot in which a character is unable to get vaccinations due to medical reasons and the story could show how others can vaccinate to protect that child. To our knowledge this has not yet been researched but could be of interest to study as an intervention.

Conclusion

This qualitative analysis of contemporary survey data provided an understanding of urban parental vaccination decision making concurrently while parents were making those decisions. Vaccination decision making is complex and can be impacted by the interplay of Sources of Influence, Deliberative Processes, and context that are similar but interpreted differently depending on a parent’s vaccination stance. Using approaches to enhance paradigms of collective responsibility may influence those hesitant parents with social responsibility beliefs. Addressing instrumental issues through vaccine delivery systems or approaches such as text reminders may address barriers for those experiencing obstacles to access. Most importantly, recognising the careful contemplation of those who choose to delay/not vaccinate their children is important for health professionals to consider in conversations with parents about vaccinations. Future research could include testing the effectiveness of motivational interviewing and the use of story books to increase vaccination uptake.

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Funding

Funding was not obtained to conduct this research study.

Availability of data and materials

The datasets generated and/or analyzed during the current study are available through Secondary Analysis to Generate Evidence (SAGE) repository, PolicyWise for Children and Families (http://sagemetadata.policywise.com/nada/index.php/catalog/1).

Author information

All authors contributed to data analysis, interpretation, writing, and critically reviewing the manuscript and have given final approval for this version to be published. Specific additional author contributions are as follows: SWM and ST contributed to acquisition of the data. DAM contributed to the initial conceptualization of the study design.

Correspondence to Melissa Mueller.

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Ethics approval and consent to participate

Ethics approval was obtained from the University of Calgary Conjoint Research Ethics Board (ID: REB14–0925). Consent to participate was obtained from all participants in a written format by the AOB study team.

Consent for publication

This concern is not applicable for the current research study.

Competing interests

The authors declare that they have no competing interests.

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Keywords

  • Childhood vaccination
  • Immunization
  • Maternal perspective
  • Qualitative analysis