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Table 1 Number of respondents by age and year of data collection

From: Tracking of leisure-time physical activity during adolescence and young adulthood: a 10-year longitudinal study

Year

1990

1991

1992

1993

1995

1996

1998

2000

Age

13

14

15

16

18

19

21

23

N1

924

958

936

789

779

643

634

630

  1. 1 During the first two years of the study those families and students who moved to the district of the participating schools were invited to enrol into the study, thus the n increased the first two years.