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Table 2 Number of participants in the longitudinal studies1 in Oslo and Hedmark according to gender and ethnicity

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

   Baseline 2001 Follow-up 2004
   Participants Participated and
accepted linkage of
data2
Participants who
accepted linkage of
data2and provide DNA3
   N n % n %
Oslo       
Total4   3811 2489 65.3 2433 97.7
Ethnicity6:       
Norway/western Girls 1424 1103 77.5 1078 97.7
  Boys 1456 906 62.2 893 98.6
Non-western Girls 422 261 61.8 249 95.4
  Boys 425 192 45.2 186 96.9
Hedmark       
Total5   1939 827 42.7 796 96.3
Ethnicity7:       
Norway/western Girls 950 494 52.0 477 96.6
  Boys 931 317 34.0 303 95.6
Non-western Girls 17 6 35.3 6 100.0
  Boys 25 9 36.0 9 100.0
  1. 1Participated both in the baseline study 2001 and in the follow-up 2004;
  2. 2Participants accepting linkage of data to other health surveys and registers, i.e. linkage of data to the baseline data;
  3. 3 Percent providing DNA among participants accepting linkage of data; 4,5Due to missing data in Oslo on gender and/or ethnicity (84), and in Hedmark on ethnicity (16), the numbers will not sum up to the total numbers in Oslo, nor Hedmark; 6,7Based on self-reported native country of mother and father.