Table 2

Multivariate odds ratios of non-response to a second assessment of body weight in the EPIC-PANACEA studya
Participants available for 2nd assessment (n= 460,691)
Number of participants n Non-responders (n= 84,876) n (%) ORb 95% CI
Sex
Missing 0
Male 130,030 26,190 (20.1) 1.0
Female 330,661 58,686 (17.7) 0.92 0.90, 0.94
Age
Missing 0
≤40 years 50,789 14,911 (29.4) 1.0
41-60 years 317,177 51,997 (16.4) 0.48 0.47, 0.49
>60 years 92,725 17,968 (19.4) 0.51 0.50, 0.53
Marital status
Missing 106,239
Married/living together 279,994 52,581 (18.8) 1.0
Living alonec 74,458 19,077 (25.6) 1.4 1.37, 1.43
Highest educational level
Missing 19,063
College or university 110,246 18,893 (17.1) 1.0
Other secondary school 100,618 15,447 (15.4) 0.93 0.90, 0.95
Vocational secondary school 104,299 23352 (22.4) 1.08 1.05, 1.10
Primary school or less 126,465 22,300 (17.6) 1.35 1.31, 1.38
Cambridge physical activity index
Missing 65,002
Active 73,596 13,859 (18.8) 1.0
Moderately active 96,772 14,710 (15.2) 0.98 0.95, 1.01
Moderately inactive 137,438 20,802 (15.1) 0.99 0.96, 1.01
Inactive 87,883 14,593 (16.6) 1.15 1.12, 1.19
Smoking status
Missing 9,722
Never 227,854 37,297 (16.4) 1.0
Former 122,690 23,209 (18.9) 1.02 1.00, 1.04
Current 100,425 22,452 (22.7) 1.33 1.30, 1.35
Alcohol consumption
Missing 0
Light alcohol users 302,995 59,630 (19.7) 1.0
Non-users 61,316 10,467 (17.1) 1.18 1.15, 1.21
Moderate alcohol users 84,255 12,901 (15.3) 0.96 0.93, 0.98
Heavy alcohol users 12,125 1,878 (15.5) 1.12 1.06, 1.19
Cancer at baseline
Missing 16,618
No 423,646 76,910 (18.2) 1.0
Yes 20,427 3,954 (19.4) 0.86 0.81, 0.91
Chronic disease at baselined
Missing 45,998
Healthy 378,342 63,115 (16.7) 1.0
Disease 36,351 7,027 (19.3) 1.33 1.27, 1.39
Cancer before 2ndweight assessment
Missing 0
No 448,198 81,752 (18.2) 1.0
Yes 12,493 3,124 (25.0) 1.39 1.33, 1.45
BMI
Missing 334
18.5 - 25 kg/m2 236,019 43,404 (18.4) 1.0
< 18.5 kg/m2 6,868 1,451 (21.1) 1.16 1.09, 1.23
25 - 29.9 kg/m2 157,093 29,072 (18.5) 1.08 1.06, 1.10
≥ 30 kg/m2 60,377 10,850 (18.0) 1.26 1.23, 1.29
Recruitment strategy
Missing 0
Postal survey 353,699 71,436 (20.2) 1.0
Approached by elephone 76,924 2,546 (3.3) 0.16 0.15, 0.16
Requested to visit study center 30,068 10,894 (36.2) 2.7 2.58, 2.78
Mean follow-up time
Missing 0
0 - 4.0 years 160,750 15,867 (9.9) 1.0
4.1 - 8.0 years 230,155 51,978 (22.6) 3.00 2.91, 3.06
8.1 - 12.0 years 69,786 17,031 (24.4) 3.26 3.16, 3.36

Abbreviations: OR - odds ratio; CI - confidence interval.

a Participants who were not (yet) approached, died or (e)migrated during follow-up were not excluded in the present analyses.

b A multivariate logistic regression model was used with response status (0 = responder; 1 = non-responder) as the dependent variable and all baseline characteristics, recruitment strategy and mean follow-up time as independent variables. All variables are mutually adjusted.

c Single, divorced/separated, widowed.

d Hypertension, stroke, myocardial infarction, diabetes mellitus.

May et al.

May et al. BMC Medical Research Methodology 2012 12:148   doi:10.1186/1471-2288-12-148

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