Distribution of vigorous physical activity variables*
| First examination (1999–2003) | Second examination (2010–2014) | |||
| n/N | % | n/N | % | |
| Frequency | ||||
| ≤1 a month | 1559/3910 | 39.9 | 1499/3896 | 38.5 |
| 1–3 times a week | 1833/3910 | 46.9 | 1736/3896 | 44.6 |
| ≥4 times a week | 518/3910 | 13.2 | 661/3896 | 17.0 |
| Duration | ||||
| ≤30 min | 1595/3880 | 41.1 | 1559/3845 | 40.5 |
| 1–3 hours | 1675/3880 | 43.2 | 1514/3845 | 39.4 |
| ≥4 hours | 610/3880 | 15.7 | 772/3845 | 20.1 |
| Active | ||||
| ≥2 times a week and ≥1 hour | 1450/3878 | 37.4 | 1635/3843 | 42.5 |
| Changes between first (1999–2003) and second (2010–2014) examinations | ||||
| Inactive at both examinations | 1637/3816 | 42.9 | ||
| Active at first examination but inactive at second examination | 551/3816 | 14.4 | ||
| Inactive at first examination but active at second examination | 752/3816 | 19.7 | ||
| Active at both examinations | 876/3816 | 23.0 | ||
*There was a significant change in the distributions of all physical activity parameters (frequency, duration and active status) across the two examinations (McNemar-Bowker test, all P values <0.001).
n, number of cases; N, total available sample size.