Table 5

Prevalence ratio and absolute difference (%) of participation (n = 50 807)versusno participation*(n = 36 135) in the HUNT3 main questionnaire by different characteristics
Characteristic Prevalence ratio Difference in participation (%)
Crude Adjusted 95% CI Crude Adjusted 95% CI (%)
Sex (women/men) 1.17 1.23 1.20, 1.26 9.2 12.6 11.8,13.3
20-39 year 1 1 Reference 0 0 Reference
40-59 year 1.63 1.45 1.40, 1.50 25.2 19.1 18.2, 20.0
60-79 year 1.88 1.74 1.68, 1.81 34.7 29.9 29.0, 30.8
80 + yrs 1.12 1.23 1.16, 1.30 4.8 10.7 9.2, 12.1
Education
9 year or less 1 1 Reference 0 0 Reference
10-12 year 1.28 1.27 1.23, 1.30 13.6 13.6 12.8, 14.5
University 1.39 1.36 1.31, 1.41 19.0 17.4 16.4, 18.4
Marital status
Unmarried 1 1 Reference 0 0 Reference
Divorced/Widower 1.27 1.01 0.97, 1.05 11.6 −1.8 −3.0, -0.6
Married/cohabits 1.64 1.29 1.25, 1.33 27.3 14.5 13.5, 15.4
Income
Quintile 1 1 1 Reference 0 0 Reference
Quintile 3 1.39 1.32 1.09, 1.60 15.9 15.1 10.0, 20.1
Quintile 5 1.49 1.42 1.17, 1.73 20.4 20.4 15.6, 25.1
Municipality
Urban / rural 0.93 0.91 0.89, 0.93 6.1 −5.6 −6.4, -4.7
Social security #
Disability pension 0.97 0.92 0.88, 0.96 −19.2 −6.5 −7.8, -5.2
Social benefit 0.43 0.61 0.56, 0.67 −32.8 −17.9 −20.2,-15.5

*Participants that answered the nonparticipation questionnaire (QNP) were not included.

¤ Binomial regression, adjusted for all other variables except social security factors.

#Analysis restricted to subjects below 65 years of age and all variables entered in the adjusted model.

Langhammer et al.

Langhammer et al. BMC Medical Research Methodology 2012 12:143   doi:10.1186/1471-2288-12-143

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