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Table 3 Baseline socio-demographic characteristics in 2001, prevalence and relative risk (RR) of lost to follow-up in 2004 in Oslo and Hedmark combined

From: Response rates and selection problems, with emphasis on mental health variables and DNA sampling, in large population-based, cross-sectional and longitudinal studies of adolescents in Norway

Variables collected Base-line Lost to follow-up Relative risk of lost to follow-up
In 2001 N n % RRcrude 1 95% CI RRadj 1,2 95% CI
Gender 3          
Boys 2894 1455 50 Ref    Ref   
Girls 2835 958 34 0.67 0.63 0.72 0.72 0.67 0.77
Ethnicity 4          
Western 4768 1948 41 Ref    Ref   
Non western 896 428 48 1.17 1.08 1.26 1.31 1.21 1.43
Invitation group          
Oslo school 2493 388 16 Ref      
Oslo post 1145 761 66 4.27 3.86 4.72    
Hedmark post 1710 883 52 3.32 3.00 3.68    
Education plans          
University/higher 2847 911 32 Ref    Ref   
Other 1940 1119 58 1.80 1.69 1.93 1.23 1.15 1.33
Not decided yet 859 336 39 1.22 1.11 1.35 1.07 0.96 1.18
Family economic situation          
Bad 184 108 59 Ref    Ref   
Average 1824 847 46 0.79 0.69 0.90 0.86 0.75 0.99
Good 3014 1155 38 0.65 0.57 0.74 0.82 0.71 0.94
Very good 620 266 43 0.73 0.63 0.85 0.95 0.81 1.12
Education father          
Lower secondary 786 381 48 Ref    Ref   
Upper secondary 2470 1082 44 0.90 0.83 0.98 0.97 0.89 1.05
University/College 1837 471 26 0.53 0.48 0.59 0.79 0.71 0.87
Income father          
Low 1190 585 49 Ref    Ref   
Medium 2654 1011 38 0.77 0.72 0.84 0.84 0.78 0.90
High 1161 304 26 0.53 0.48 0.60 0.80 0.72 0.88
Parents' marital status          
Married 3891 1518 39 Ref    Ref   
Not married 1806 876 49 1.24 1.17 1.32 1.13 1.06 1.21
  1. 1When substituting "lost to follow-up" with "failure to provide DNA" as dependent variable, the RRs were similar;
  2. 2Adjusted for invitation group;
  3. 3Gender does not sum up to 5750 as shown in Figure 1 and Table 1 due to "missing information on gender" on 21 individuals;
  4. 4Based on self-reported native country of mother and father.