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Table 3 Odds ratios for the association between key determinants and vaccination uptake among Dutch parents/guardians, and interaction between ethnic group and these determinants. HPV vaccination acceptability study among parents/guardians, in Amsterdam, the Netherlands, 2014

From: A longitudinal study on determinants of HPV vaccination uptake in parents/guardians from different ethnic backgrounds in Amsterdam, the Netherlands

  

Interaction effect

 

SNA vs Nl

MENA vs NL

Other vs NL

Overall

NL-OR

xOR

p-value

xOR

p-value

xOR

p-value

p-value

Intention

5.19

0.54

0.128

0.58

0.020

0.57

0.042

0.060

Subjective norms

3.90

0.16

0.025

0.18

0.002

0.70

0.604

0.006

Habit strength

1.36

1.43

0.415

0.44

<0.001

0.58

0.045

0.001

Information processing

0.83

0.40

0.141

1.37

0.265

0.57

0.153

0.043

Childhood vaccination

 Not all

1

       

 All

8.52

0.33

0.320

0.65

0.647

0.30

0.159

0.519

  1. The final multivariable model contains all variables significantly associated with HPV vaccination uptake in one of the ethnic groups
  2. p-values < 0.05 are indicated in bold
  3. NL denotes participants with a Dutch ethnicity, SNA denotes participants with a Surinamese, Netherlands Antillean or Aruban ethnicity, MENA denotes participants with a Middle Eastern or North African ethnicity (including Turkish participants), Other denotes participants from all other ethnicities
  4. Interpretation of the OR of continuous determinants: If a determinant increases with one unit, we expect to see the odds to be HPV vaccinated to increase with the specified ratio for that determinant (i.e. received 1 or 2 doses). For example, if among the Dutch intention increases with one unit, we expect to see the odds to be HPV vaccinated to increase 5.19 times
  5. Interpretation of the OR of categorical determinants: the odds to be vaccinated are x-times higher in the non-reference categories compared to the reference category. For example, in the Dutch group if the daughter received all childhood vaccinations the odds to also become HPV vaccinated (i.e. received 1 or 2 doses) is 8.52 times higher compared to when the daughter did not receive all childhood vaccinations. Interpretation of xOR: this is the odds ratio of the interaction factor. It indicates the factor with which the OR of the Dutch group should be multiplied to obtain the odds ratio for that determinants in that particular non-Dutch group. For example, the xOR for intention in the MENA group is 0.58. In order to obtain the odds ratio for the MENA-group for the effect of one step increase in the intention scale on vaccination uptake, one multiplies the OR of the Dutch group (5.19) with this xOR (0.58), resulting in an OR of 3.01. So the effect of intention on vaccination uptake is significantly (p = 0.020) less strong than in the Dutch group