Table 1. Body weight, BMI and physical activity categories at baseline and follow-ups; the EPIC-Norfolk study.
| Variable | Baseline | Follow-up 18 months |
Follow-up 3 y | Follow-up 10 y |
|---|---|---|---|---|
| Men | ||||
| N | 11607 | 5586 | 6582 | 6773 |
| Weight 1, mean (SD), kg | 80.38 (11.5) | 80.19 (11.3) | 81.38 (11.54) | 81.79 (11.9)** |
| BMI1, mean (SD), kg/m2 | 26.52 (3.3) | 26.49 (3.3) | 26.88 (3.34) | 27.20 (3.5)** |
| N (%) obese2 | 1550 (13.4) | 635 (12.3) | 998 (15.19) | 1229 (18.9)** |
| Physical activity category1 | ||||
| N (%) inactive | 3586 (30.9) | 1981 (35.5) | 2441 (36.0) | |
| N (%) moderately inactive | 2858 (24.6) | 1408 (25.2) | 1565 (23.1) | |
| N (%) moderately active | 2660 (22.9) | 1105 (19.8) | 1397 (20.6) | |
| N (%) active | 2502 (21.6) | 1092 (19.6) | 1370 (20.2)* | |
| Women | ||||
| N | 14032 | 7252 | 8448 | 8874 |
| Weight 1, mean (SD), kg | 67.95 (11.8) | 67.34 (12.5) | 68.69 (11.84) | 68.78 (12.0)** |
| BMI1, mean (SD), kg/m2 | 26.23 (4.4) | 25.97 (4.6 ) | 26.53 (4.37) | 26.46 (4.4)** |
| N (%) obese2 | 2375 (17.0) | 999 (15.0) | 1564 (18.54) | 1659 (19.7)** |
| Physical activity category1 | ||||
| N (%) inactive | 4277 (30.5) | 2535 (35.0) | 3304 (37.2) | |
| N (%) moderately inactive | 4493 (32.0) | 2489 (34.3) | 2651 (29.9) | |
| N (%) moderately active | 3117 (22.2) | 1385 (19.1) | 1678 (18.9) | |
| N (%) active | 2147 (15.3) | 843 (11.6) | 1241 (14.0)* |
1
Test for trend was conducted to determine whether body weight and BMI significantly differ by follow-up status. Χ2-tests were performed to assess the differences in proportions of participants in each physical activity category according to follow-up status. Information on physical activity at the 3-year follow-up was assessed by a different questionnaire and these results are not shown in this paper.
2
Obesity was defined as BMI>30kg/m2.
*
p<0.01;
**
p<0.001