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Applying the information–motivation–behavioral model to explore the influencing factors of self-management behavior among osteoporosis patients

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Abstract

Background

The prevalence of osteoporosis (OP) is rapidly increasing. Healthy behaviors are crucial for the management of OP. Application of the information–motivation–behavioral skills (IMB) model has been verified in various chronic diseases, but this model has not been investigated for behavioral interventions among people with OP. This study aimed to examine factors influencing OP self-management behavior and their interaction paths based on the IMB model.

Methods

We conducted a cross-sectional study using a convenience sampling method in 20 community health service centers in Shanghai, China. Predictive relationships between IMB model variables and self-management behaviors were evaluated using an anonymous questionnaire. Structural equation modeling was used to test the IMB model.

Results

In total, 571 participants completed the questionnaire, of which 461 (80.7%) were female. Participants’ mean age was 68.8 ± 10.1 years. Only 101 (17.7%) participants were classified as having better OP self-management behaviors. The model demonstrated the data had an acceptable fit. Paths from information to self-efficacy (β = 0.156, P < 0.001) and self-management behaviors (β = 0.236, P < 0.001), from health beliefs to self-efficacy (β = 0.266, P < 0.001), from medical system support to self-efficacy (β = 0.326, P < 0.001) and self-management behaviors (β = 0.230, P < 0.001), and from self-efficacy to self-management behaviors (β = 0.376, P < 0.001) were all significant and in the predicted direction.

Conclusion

This study validated the utility of the IMB model for OP self-management behaviors in this population. Middle-aged and older adult patients with OP have poor self-management behaviors. Enhanced knowledge about OP and is important for improving self-management behaviors.

Peer Review reports

Background

Osteoporosis (OP) is a systemic skeletal disease characterized by low bone mass and microarchitectural deterioration of bone tissue, with consequent increases in bone fragility and susceptibility to fracture [1]. With the gradual acceleration of population aging, the prevalence of OP in China is increasing each year. A meta-analysis showed that the prevalence of OP in China was 14.94% in 2008, but rose to 27.96% in 2015 [2]. Chronic pain caused by OP seriously interferes with normal daily activities. Mortality exceeds 20% within 6–12 months after a fracture [3], and the disease is associated with a huge economic burden that is expected to increase significantly over coming decades [4]. Given the long-term health damage and large economic losses associated with OP, there is an urgent need to improve the prognosis of OP. No ideal pharmacological agent has been identified for the treatment of OP [5], but safe and effective medications are available to reduce the risk for fractures [6]. However, OP medication adherence remains a major problem. One review that included 124 studies [7] reported the prevalence of medication adherence ranged from 12.9 to 95.4%. Ross et al. [8] reported that fracture risk increased by approximately 30% with medication noncompliance and by 30–40% with non-persistence. Low medication adherence was also associated with a 37% increase in the risk for all-cause hospitalization [9]. The relative risk reduction at 12 months for hip fracture was 60% for persistent compared with non-persistent patients [10].

OP is a chronic disease, like diabetes and hypertension [11]. Management of most chronic illnesses is characterized by extensive responsibility assumed by patients [12]. Barlow [13] defined self-management as an individual’s ability to manage the symptoms, treatment, physical and psychosocial consequences, and lifestyle changes inherent in living with a chronic condition. Improvement of self-management behaviors (e.g., exercise and diet) and cognitive behaviors (e.g., effective coping) are primary focus areas for these types of disease interventions [14]. Participation in self-management behaviors is seen as the proximal outcome that influences the long-term distal outcome of improved health status [15].

Modification of health behaviors requires consideration of factors that influence healthy behaviors [16]. A previous qualitative study showed that pre-requisites for OP patients to adopt self-care behaviors included increasing their hope of living longer, physician’s attention to the patient’s needs, media promotion, and family support [17]. Other studies have found close relationships between OP knowledge, health beliefs, self-efficacy, and health behaviors [18,19,20]. As a predictor, self-efficacy is supposed to facilitate the formation of behavioral intentions, development of action plans, and initiation of actions [21]. Although knowledge is often considered insufficient for behavioral change, information about OP may be important in developing OP self-management behaviors [22]. Health belief constructs vary in their effectiveness as predictors of behavior [23]. A meta-analysis of health belief studies found that susceptibility and perceived barriers were the most powerful behavioral influences [24]. Social support has also been noted as critical to the success of a person’s ability to self-manage [12].

Application of theory-based health behavior change models is the current trend in OP self-management education. This is because systematic models are more likely to effectively change behaviors and maintain behavioral changes than health information alone [25]. There are several models for the prevention of fragility fractures and treatment of OP, including the health belief model [26], knowledge attitudes and practices model [27], social cognitive theory [28], and motivational interviewing [29]. A theoretical model that has received widespread attention in the literature is the information–motivation–behavioral skills (IMB) model, which is based on a critical review and integration of constructs from several theories of health behavior. The IMB model was first applied with high-risk groups (e.g., people with AIDS) and has gradually been applied to those with chronic diseases such as diabetes [30]. The IMB model is useful in explaining factors that influence healthy behavior.

Fisher and Fisher [31] first proposed the IMB model in 1992. Compared with previous health-related behavior change models, the IMB model draws on the understanding of “motivation” from rational behavior theory, and introduces the concept of “self-efficacy” drawn from social cognitive theory. Potential factors are summarized in three components: information, motivation, and behavioral skills [32]. Information refers to accurate behavior-specific knowledge. Motivation is defined as an integrated function of personal motivation and social motivation. Personal motivation reflects an individual’s attitude or belief, and social motivation rests on their perception of social support. Behavioral skills include an individual’s self-efficacy and objective skills for performing a behavior [33]. The IMB model of adherence [34] suggests that adherence information and motivation often covary, but adherence motivation may be present when adherence information is inaccurate or insufficient, and vice versa [21]. If individuals have sufficient behavior-specific information, they are more inclined to build behavior skills and motivation and then to engage in the targeted health behavior [33]. However, information and motivation may also directly affect behavior when complex behavioral skills are not required for the performance of the behavior [35].

To our knowledge, no studies have investigated the IMB model for an OP behavioral intervention. This study aimed to explore factors influencing OP self-management behaviors and their interaction paths based on the IMB model. Understanding the relationships among the cognitive, emotional, and behavioral skills factors that influence healthy behaviors for OP in the IMB model may support the development and implementation of evidence-based interventions for OP in the community.

Method

Study site

We conducted this cross-sectional study in December 2016. We recruited patients from 20 community health service centers in Shanghai, China, using a convenience sampling method. These 20 primary healthcare centers included 10 urban and 10 suburban areas, and each center had an OP clinic. Community health service centers provide free bone mineral density (BMD) testing and professional guidance from specialist OP doctors.

Inclusion criteria

The inclusion criteria were: 1) peak BMD value measured by a dual-energy X-ray absorption (DXA) detector lower than the standard reference population by at least 2.5 standard deviations or more (T-score ≤ 2.5); 2) provided informed consent and willing to cooperate with the research; and 3) aged ≥45 years.

Recruitment and procedure

With the help of the Community Health Center, our investigators carried out face-to-face interviews with the patients who volunteered to participate in this study. Before filling in the questionnaire, the investigator fully explained the purpose of the survey to the participants and emphasized the protection of privacy. The questionnaire covered information about participant demographics and the constructs of the IMB model. The questionnaire took 30 min to complete. Participants were compensated 50 RMB (approximately 8 USD) for their participation after completion. This study was reviewed and approved by the Ethics Committee of the School of Public Health, Shanghai Jiao Tong University.

Sampling size

In the structural equation modeling studies, the sample size should be at least 100, preferably 200 or more [36]. If the number of samples is analyzed from the number of observed variables in the model, the ratio between the number of samples and the number of observed variables is at least 10:1 to 15:1 [37]. Based on the number of observed variables and the actual situation of the community, we recruited 600 patients, with 30 patients included from each center. 600 participants were recruited to the study, of whom 571(95.2%) completed the questionnaire adequately for further analysis.

Measures

Basic data

The collected demographic characteristics included participants’ self-reported sex, age, body mass index, highest education level, current marital status, income, family history of OP, OP duration, calcium supplement use, and recent BMD measurements. (Please see Additional file 1 for the questionnaire.)

Information: OP knowledge

Information on OP knowledge was measured using the 32-item version of the OP Knowledge Test (OKT). This test has two subscales: nutrition (items 1–11 and 18–32) and exercise (items 1–17 and 30–32). Response options for each item were “Right,” “Wrong,” or “I don’t know.” Items were scored as correct or incorrect, with correct answers coded as 1 and incorrect answers coded as 0. A higher score indicates a higher level of information. The OKT demonstrated internal consistency (Cronbach’s alpha coefficients: total scale = 0.859, nutrition subscale = 0.839, and exercise subscale = 0.781).

Motivation: personal motivation and social support

Personal motivation: health beliefs

This part of the questionnaire used the 42-item version of the OP Health Belief Scale (OHBS) [38], which includes seven subscales: susceptibility (items 1–6); seriousness (items 7–12); benefits exercise (items 13–18); benefits calcium intake (items 19–24); barriers exercise (items 25–30); barriers calcium intake (items 31–36); and health motivation (items 37–42). The OHBS is scored by awarding points based on responses to each item (e.g., “Strongly Agree” = 5 points to “Strongly Disagree” = 1 point). Because there were six items in each subscale, the possible score for each subscale was 6–30, and the possible total score was 42–210. Test-retest reliability for the total instrument was 0.90, with the subscale reliabilities ranging from 0.778 to 0.920.

Social support: medical system support

We measured community medical system support for patient self-management behaviors. Patient compliance and understanding has been linked to the quality of physician explanations and the physician-patient relationship [39]. This part of the questionnaire included 11 items, with responses on a 5-point Likert scale (“Strongly Disagree” to “Strongly Agree”). The Cronbach’s alpha coefficient was 0.960.

Behavioral skills: self-efficacy

This part of the questionnaire used the 21-item version of the OP Self-Efficacy Scale (OSES) [40], which was developed as a measure of self-efficacy (or confidence) in behaviors related to physical activity and calcium intake [41]. The instrument comprises an exercise subscale (items 1–10) and a calcium intake subscale (items 11–21). The scoring method for the scale is an 11-point scoring method from 0 (“No Confidence At All”) to 10 (“Full Confidence”). A higher score represents stronger self-efficacy. In the present study, the reliability coefficient for the internal consistency of the total tool was 0.97, and those for the exercise and calcium intake subscales were 0.973 and 0.968, respectively.

Behavior: self-management behaviors

This section of the questionnaire used the Patient OP Self-Management Scale, which covers nutrition, exercise, and treatment-related behaviors. The Chinese version of this tool was validated by Shen et al. [42]. The scale uses a 5-point Likert scoring method. The patient selects the response option corresponding to the frequency of completing various behaviors in the past 30 days. A larger score indicates higher frequency, with a score of 1 point meaning “Never” and a score of 5 points meaning “Frequent.” The overall Cronbach’s alpha coefficient for this scale was 0.889, and those for the dimensions were 0.812–0.928. In this study, a score of 4 points or above was defined as “better self-management behaviors.”

Statistical analyses

Data were collected using Epidata 3.1 software (EpiData Association, Odense, Denmark). We use the mean or median of the result in the rest of the samples to replace the missing values (missing data< 1%).After data entry and checking, data analyses were performed with SPSS version 20.0 (IBM Corp. Released 2013. IBM SPSS Statistics for Windows, Version 22.0. Armonk, NY: IBM Corp). Continuous variables were described as mean ± standard deviation (SD), and binary and categorical variables were described as frequency (percentage). The level of statistical significance was set at 0.05 for all analyses. We used linear regression to analyze the relationships between demographic characteristics and self-management behaviors (univariate analysis). In the examination of relationships between influencing factors and self-management behaviors, each impact factor was analyzed using linear regression. When investigating the paths of self-management behaviors, AMOS 23.0 (Arbuckle, J. L. (2014). Amos (Version 23.0). Chicago: IBM SPSS) was used to analyze the paths in the recursive model. Mediation effects were tested using a bias-corrected bootstrap method in AMOS 23.0.

Results

Sociodemographic characteristics

Table 1 presents participants’ basic sociodemographic information. Of the 571 participants, 110 (19.3%) were male and 461 (80.7%) were female. Participants’ mean age was 68.8 ± 10.1 years, 133 (23.3%) participants had a primary school or below education, and 382 (66.9%) had a monthly income > 3000 RMB. In addition, 110 (18.4%) participants had family history of OP, 469 (78.6%) had been diagnosed with OP in the past 5 years, 377 (63.1%) had present use of calcium supplements, and 140 (23.5%) had no BMD measurements within 1 year.

Table 1 Participants’ sociodemographic characteristics and their associations with osteoporosis self-management behaviors (N = 571)

The linear regression analyses showed that five sociodemographic characteristics had a statistically significant impact on OP self-management behavior. These were: female sex (β = 2.28, 95% confidence interval [6]=0.394–4.166); high education level (β = 7.395, 95% CI = 5.117–9.672); high income (β = 2.571, 95% CI = 1.003–4.140); family history of OP (β = 2.802, 95% CI = 0.887–4.718); and OP diagnosis for ≥10 years (β = 1.869, 95% CI = 0.385–3.354).

Summary statistics of model variables

The descriptive information for each measure is presented in Table 2. The mean ± SD values were 15.85 ± 6.18 for the OKT total score, 147.33 ± 17.91 for the OHBS total score, 43.53 ± 7.85 for the medical system support score, and 127.55 ± 40.53 for the OSES total score. The linear regression analysis showed that these four variables had statistically significant effects on OP self-management behavior.

Table 2 Model variables associated with osteoporosis self-management behaviors (N = 571)

The mean ± SD for the OP self-management behaviors score was 34.73 ± 9.09, and 101 (17.7%) participants were classified as having better OP self-management behaviors. Among these participants, 87 (15.2%) participants had better self-management behaviors in the nutrition dimension and 122 (21.4%) in the exercise dimension.

Model testing

Figure 1 shows the model outcomes with estimates for regression weights, correlations, and path coefficients. The results were: χ2 = 956.951, df = 10, P < 0.001, goodness of fit index (GFI) = 1.000, adjusted goodness of fit index (AGFI) = 0.998, normed fit index (NFI) = 1.000, comparative fit index (CFI) = 1.000, and root mean square error of approximation (RMSEA) = 0.000. These results indicated that the model fit the data.

Fig. 1
figure1

Estimation of the modified Information-Motivation-Behavioral skill model of OP self-management behaviors (N = 571)

The model was interpreted as follows. We estimated a model in which personal and social motivations to adhere were permitted to co-vary. Health beliefs and medical system support significantly co-varied (r = 0.589, P < 0.001). Information for motivation (health beliefs and medical system support) significantly co-varied (r = 0.462, P < 0.001 and r = 0.294, P < 0.001, respectively). Paths from information to self-efficacy (β = 0.156, P < 0.001) and self-management behaviors (β = 0.236, P < 0.001), from health beliefs to self-efficacy (β = 0.266, P < 0.001), from medical system support to self-efficacy (β = 0.326, P < 0.001) and self-management behaviors (β = 0.230, P < 0.001), and from self-efficacy to self-management behaviors (β = 0.376, P < 0.001) were significant and in the predicted direction. Paths from health beliefs to self-management behaviors (β = − 0.020, P = 0.586) were insignificant.

Testing of mediation effects

The mediation test results for the relationships among information, health beliefs, medical system support, self-efficacy, and self-management behaviors are summarized in Table 3. The indirect effects of health beliefs mediated self-management behaviors through self-efficacy as presented in our final model was 0.051 (95% CI = 0.034–0.070). There were no direct effects between health beliefs and self-management behaviors. The indirect effects of information and medical system support mediated self-management behaviors through self-efficacy were 0.060 (95% CI = 0.030–0.097) and 0.142 (95% CI = 0.098–0.190), respectively.

Table 3 Effects of information, health beliefs, and medical system support on osteoporosis mediated through self-efficacy examined by a bias-corrected bootstrap method

Discussion

In this study, we examined whether the IMB model could predict OP self-management behaviors, and investigated how the model constructs influenced self-management behaviors among patients with OP. Overall, the results indicated that the IMB model-based framework for understanding self-management behaviors was well positioned to explain the sample data.

First, information, health beliefs, and medical system support were associated with self-efficacy, which in turn was correlated with self-management behaviors. This highlighted the importance of self-efficacy in health interventions for OP self-management behaviors. Self-efficacy is an individual’s ability to change their behavior, which is fundamental in reducing the incidence of chronic diseases and improving health outcomes [43]. Second, paths from information were directly associated with self-efficacy and self-management behaviors. In other diseases, inconsistencies were observed between information and preventive behavior [44]. This difference may be attributable to differences in the types of disease and levels of cognition. Infectious diseases such as AIDS are of wide concern and have a high level of cognition, whereas OP is a chronic disease that is not easily detected, and people generally lack OP-related knowledge. Information may have a significant impact on initial behavioral changes, suggesting that having better knowledge about OP may directly help Chinese patients with OP to improve their self-management behaviors. Sedlak et al. [45] found that personal knowledge of BMD obtained through DXA screening had a more powerful relationship with OP preventive behaviors than general knowledge of OP. This finding has important implications for healthcare providers. Third, paths from medical system support were directly associated with self-efficacy and self-management behaviors. Chinese patients usually rely on physician’s suggestions for disease treatment, and receive healthcare services from primary healthcare providers. This suggests that we should include OP in the standardized management of community health centers, similar to management for diabetes and high blood pressure. Fourth, health beliefs had an indirect effect on self-management behaviors through self-efficacy. A previous meta-analysis reported there were no significant predictive relationships between individual illness belief domains and adherence to self-management behaviors in 14 of 52 included papers [46]. Interactions between different dimensions of health beliefs might have influenced potential associations with adherence to self-management behaviors.

Understanding of OP has advanced in the medical community, but translation of this knowledge to the lay community has lagged behind. Patients often take a laissez-faire attitude toward OP that can affect self-management behaviors [4]. In this study, only 101 (17.7%) participants had better OP self-management behaviors. Better self-management behaviors were observed in 87 (15.2%) participants in the nutrition dimension and 122 (21.4%) participants in the exercise dimension, which was lower than the 50.4 and 38.9% for these dimensions reported for patients with diabetes in a previous study [47]. In particular, there was a large difference in the nutrition dimension in our study compared with the previous study. Therefore, nutrition labeling knowledge should be popularized in future health education efforts to help residents choose healthy foods. In general, the self-management behaviors for OP in middle-aged and older adult patients were poor. We recommend that OP should be included in the standardized management of chronic diseases in the community to help patients establish good self-management behaviors.

Limitations

First, the cross-sectional data prevented us from drawing conclusions about true causal mediation and an ability to test the IMB model’s proposed feedback loop from health outcomes to information and motivation [34]. Second, we used convenience sampling, which limited the representativeness of our sample. We selected 20 community health service centers for an OP medical treatment management pilot study in Shanghai. The scope of the sample in this study was broad, meaning the sample reflects the actual situation in shanghai to some extent. Further extensive unbiased studies and a cohort study in a larger population are warranted to confirm the results. Third, data were gathered from a self-reported questionnaire, and consequently the reliability of responses to sensitive questions may be questionable. Fourth, because of the lack of objective skills for testing behavior in OP, the behavioral skills in this study were tested using only one dimension (self-efficacy). This research focused on exploring support from the medical system, but further research needs to consider more dimensions.

Conclusions

Our study is the first to assess the relevance of the IMB model for OP self-management behaviors. Middle-aged and older adult patients with OP have poor self-management behavior. Medical system support can help patients develop good self-management behavior. OP-related knowledge can change patients’ cognition, help improve patients’ self-confidence (self-efficacy), and establish good self-management behaviors. Therefore, it should be considered in health management.

Availability of data and materials

The datasets analyzed in the current study are available from the corresponding author on reasonable request.

Abbreviations

AGFI:

Adjusted Goodness of Fit Index

BMD:

Bone mineral density

CFI:

Comparative Fit Index

DXA:

Dual-energy X-ray absorption

GFI:

Goodness of Fit Index,

IMB:

Information–Motivation–Behavioral Skills

NFI:

Normed Fit Index

OHBS:

Osteoporosis Health Belief Scale

OKT:

Osteoporosis Knowledge Test

OP:

Osteoporosis

OSES:

Osteoporosis Self-Efficacy Scale

RMSEA:

Root Mean Square Error of Approximation

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Acknowledgments

We are especially grateful to the patients who volunteered to participate in this study. We thank the 20 community health centers for helping us to organize our investigation. We also thank Alison Sherwin, PhD, from Liwen Bianji, Edanz Group China (www.liwenbianji.cn/ac) for editing the English text of a draft of this manuscript.

Funding

founding for the study was supported by the Youth Science Fund Project of the National Science Foundation of China (NO:71603167).

Author information

LT, YC and TS participated in the research design; LT performed statistical analysis and drafted manuscripts; YC and TS provided assistance in modifying the manuscript; HWW, QMS, YS, SXZ, RJC, XYL participate in the investigation. All the authors read and approved the final manuscript.

Correspondence to Tian Shen or Yong Cai.

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Ethics approval and consent to participate

The study protocol was approved by the Ethics Committee of School of Public Health, Shanghai Jiaotong University (Approval No.2016012). All participants gave informed written consent prior to the study.

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Not applicable.

Competing interests

The authors declare that they have no competing interests.

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Tsamlag, L., Wang, H., Shen, Q. et al. Applying the information–motivation–behavioral model to explore the influencing factors of self-management behavior among osteoporosis patients. BMC Public Health 20, 198 (2020). https://doi.org/10.1186/s12889-020-8292-x

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Keywords

  • Osteoporosis, self-management behaviors, information
  • Motivation
  • Behavioral skills model (IMB)