Baseline characteristics of participants by BMI quartile (Q1-4). Numbers are mean (SD) unless stated otherwise
| Q1 | Q2 | Q3 | Q4 | p Value (heterogeneity) | |
|---|---|---|---|---|---|
| Men | |||||
| Mean BMI (kg/m2) | 19.02 | 20.81 | 22.15 | 24.67 | |
| BMI range (kg/m2) | 13.28–20.13 | 20.14–21.47 | 21.48–22.92 | 22.93–36.20 | |
| n (%) | 2116 (25.4%) | 2105 (25.2%) | 2092 (25.1%) | 2022 (24.3%) | |
| Age (y) | 20.47 (3.13) | 20.70 (3.36) | 20.99 (3.61) | 22.35 (5.33) | <0.001 |
| Height (cm) | 175.17 (6.30) | 175.19 (5.96) | 174.68 (6.20) | 173.91 (6.80) | <0.001 |
| Weight (kg) | 58.43 (4.94) | 63.97 (4.48) | 67.66 (4.90) | 74.70 (7.63) | <0.001 |
| Number of siblings | 1.40 (1.01) | 1.50 (1.01) | 1.54 (1.03) | 1.56 (1.05) | <0.001 |
| Pulse rate (beats/min) | 76.59 (10.61) | 75.23 (9.78) | 75.09 (10.41) | 74.92 (10.53) | <0.001 |
| Social class I/II (%) | 54.96 | 56.86 | 54.92 | 55.93 | 0.54 |
| First born (%) | 57.84 | 54.77 | 53.54 | 52.08 | 0.002 |
| Smoker (%) | 35.49 | 34.16 | 32.70 | 34.62 | 0.28 |
| Women | |||||
| Mean BMI (kg/m2) | 18.59 | 20.43 | 21.90 | 24.53 | |
| BMI range (kg/m2) | 11.77–19.71 | 19.72–21.11 | 21.12–22.79 | 22.80–35.08 | |
| n (%) | 595 (25.4) | 581 (24.8) | 585 (25.0) | 579 (24.8) | |
| Age (y) | 19.54 (2.69) | 19.49 (2.67) | 19.56 (2.79) | 19.97 (3.90) | 0.027 |
| Height (cm) | 163.68 (5.77) | 163.16 (5.56) | 163.21 (5.53) | 162.63 (6.12) | 0.019 |
| Weight (kg) | 49.88 (4.51) | 54.44 (3.83) | 58.41 (4.05) | 64.94 (6.43) | <0.001 |
| Number of siblings | 1.29 (0.97) | 1.45 (1.00) | 1.43 (0.99) | 1.43 (1.04) | 0.017 |
| Pulse rate (beats/min) | 78.67 (11.05) | 76.69 (8.90) | 76.52 (9.45) | 77.13 (9.36) | 0.001 |
| Age at menarche | 13.19 (1.28) | 13.07 (1.24) | 12.93 (1.23) | 12.74 (1.20) | <0.001 |
| Social class I/II (%) | 61.01 | 63.34 | 60.00 | 60.45 | 0.66 |
| First born (%) | 66.55 | 60.07 | 59.66 | 57.69 | 0.011 |
| Smoker (%) | 19.33 | 18.07 | 20.51 | 23.14 | 0.17 |