Table 4. Hazard ratio for hypertension according to BMI (six categories).
| BMI at college age | p for Trend | ||||||
|---|---|---|---|---|---|---|---|
| <20kg/m2 (n = 53) |
20-21kg/m2 (n = 103) |
21-22kg/m2 (n = 163) |
22-23kg/m2 (n = 166) |
23-24kg/m2 (n = 76) |
≥24kg/m2 (n = 75) |
||
| Follow-up year | 29.0 (24.5–33.5) | 28.0 (25.0–32.0) | 27.0 (23.0–31.0) | 27.0 (23.0–31.0) | 28.0 (23.3–32.0) | 24.0 (21.0–30.3) | |
| Person-years of follow-up | 1542 | 2828 | 4306 | 4453 | 2099 | 1831 | |
| Diagnosed with hypertension (n, %) | 5 (9.4) | 15 (14.6) | 26 (16.1) | 29 (17.5) | 23 (30.3) | 22 (29.3) | <0.001 |
| Incidence per 10,000 parson-years | 32.4 | 53.0 | 60.4 | 65.1 | 109.6 | 120.2 | |
| Unadjusted hazard ratio (95% CI) | 1.00 | 1.80 (0.65–4.94) | 2.17 (0.83–5.64) | 2.29 (0.89–5.92) | 3.60 (1.37–9.47) | 4.72 (1.78–12.48) | <0.001 |
| Multivariable adjusted hazard ratio* (95% CI) Model 1 |
1.00 | 1.99 (0.72–5.51) | 2.37 (0.91–6.20) | 2.49 (0.96–6.44) | 3.76 (1.43–9.89) | 5.09 (1.92–13.51) | <0.001 |
| Multivariable adjusted hazard ratio* (95% CI) Model 2 |
1.00 | 1.98 (0.72–5.49) | 1.99 (0.75–5.27) | 2.44 (0.94–6.32) | 3.73 (1.42–9.83) | 4.92 (1.85–13.04) | <0.001 |
| Age, years | 0.95 (0.62–1.46) | 0.800 | |||||
| Year of graduation | 0.99 (0.94–1.04) | 0.668 | |||||
| Smoker (yes/no) | 0.68 (0.47–0.99) | 0.043 | |||||
| Current exercise status (mets*houre/week) | 0.99 (0.98–1.00) | 0.200 | |||||
| Current dietary intake (kcal/day) | 1.00 (1.00–1.00) | 0.992 | |||||
* Cox proportional hazards models adjusted for model 1: baseline characteristics (age, year of graduation and smoking and college sports club participation), model 2: current exercise status and dietary intake with model 1.