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. 2010 Oct 12;10:602. doi: 10.1186/1471-2458-10-602

Table 2.

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

Baseline 2001 Follow-up 2004
Participants Participated and
accepted linkage of
data 2 		Participants who
accepted linkage of
data 2 and provide DNA 3
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

1Participated both in the baseline study 2001 and in the follow-up 2004;

2Participants accepting linkage of data to other health surveys and registers, i.e. linkage of data to the baseline data;

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.