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Table 1 Predictors of non-response to questionnaires sent 1 year after preventive health counseling in general practice

From: The impact of non-responders on health and lifestyle outcomes in an intervention study

   Total Primary non-responders Primary responders   
N = 495 N = 179 N = 316
   n N (%) N (%) OR (95% CI) OR (95% CI)*
Socio-demographic factors at baseline Sex      
 Male 132 59 (33%) 73 (23%) 1.64 (1.06-2.50) 1.69 (1.09-2.63)
 Female 363 120 243 1 1
Age      
 ≤30 years 153 66 (37%) 87 (28%) 1.51 (1.01-2.13) 1.44 (0.95-2.20)
 >30 years 342 113 229 1 1
Civil status      
 Single 143 56 (31) 87 (28) 1.17 (0.76-1.78) 1.03 (0.6-1.59)
 Cohabitant 347 123 224 1 1
School education      
 Primary and lower secondary school 324 119 (66%) 205 (65%) 1.07 (0.72-1.61) 1.01 (0.66-1.54)
 Graduated 171 60 111 1 1
Professional training      
 No 140 56 (31%) 84 (27%) 1.26 (0.82-1.91) 120 (0.77-1.87)
 Yes 355 123 232 1  
Health-related questions at baseline Self-rated health      
 Bad 71 28 (16%) 43 (14%) 1.18 (0.68-2.03) 1.13 (0.60-2.13)
 Good 424 151 273 1 1
PCS-SF12      
 < median (low) 241 79 (45%) 163 (52%) 0.75 (0.51-1.11) 0.80 (0.52-1.23)
 > median (high) 242 95 147 1 1
MCS-SF12 (N = 483)      
 < median (low) 241 93 (53%) 148 (48%) 1.25 (0.85-1.84) 1.23 (0.84-1.96)
 > median (high) 242 81 161 1 1
Number of problems at baseline (0–33)      
 Many problems (10+) 231 82 (47%) 149 (48%) 0.97 (0.66-1.43) 0.91 (0.59-1.38)
 Fewer problems (7–9) 254 92 162 1 1
Medical contacts per year      
 >5 224 76 (43%) 148 (47%) 0.84 (0.57-1.24) 0.82 (0.54-1.24)
 ≤5 269 102 167 1 1
Smoking      
 Yes 265 102 (59%) 163 (52%) 1.29 (0.87-1.91) 1.47 (0.98-2.19)
 No 220 72 148 1 1
Factors related to the intervention study Randomized toIntervention 240 88 (49%) 152 (48%) 1.04 (0.71-1.53) 0.97 (0.66-1.42)
Control 255 91 164 1 1
Number of included patients per physician      
 Few (≤13) 115 49 (27%) 66 (21%) 1.43 (0.91-2.23) 1.39 (0.88-2.18)
   Many (>13) 380 130 250 1 1
  1. *Adjusted for the other variables in table.
  2. Proportions and odds ratios (OR).