TABLE 2.
Relative risk of all-cause mortality by body mass index* (BMI) category at study entry, Leisure World Cohort Study, 1981–2004
| BMI category | Median BMI | BMI range | No. of participants | No. of deaths | Model 1† |
Model 2‡ |
Model 3§ |
|||
|---|---|---|---|---|---|---|---|---|---|---|
| RR¶ | 95% CI¶ | RR | 95% CI | RR | 95% CI | |||||
| All participants | ||||||||||
| Underweight (BMI <18.5) | 17.6 | 12.4–18.5 | 556 | 518 | 1.51 | 1.38, 1.65 | 1.50 | 1.37, 1.64 | 1.53 | 1.40, 1.67 |
| Normal weight (BMI 18.5–24.9) | 22.4 | 18.5–25.0 | 9,021 | 7,501 | 1.00 | Reference | 1.00 | Reference | 1.00 | Reference |
| Overweight (BMI 25–29.9) | 26.5 | 25.0–29.9 | 3,376 | 2,784 | 1.01 | 0.97, 1.06 | 0.99 | 0.95, 1.03 | 0.97 | 0.93, 1.01 |
| Obese (BMI ≥30) | 31.6 | 30.0–54.1 | 498 | 400 | 1.25 | 1.13, 1.38 | 1.18 | 1.07, 1.31 | 1.12 | 1.01, 1.24 |
| Excluding the first 5 years of follow-up | ||||||||||
| Underweight (BMI <18.5) | 17.8 | 12.4–18.5 | 390 | 352 | 1.39 | 1.24, 1.54 | 1.38 | 1.24, 1.54 | 1.42 | 1.27, 1.58 |
| Normal weight (BMI 18.5–24.9) | 22.4 | 18.5–25.0 | 7,611 | 6,091 | 1.00 | Reference | 1.00 | Reference | 1.00 | Reference |
| Overweight (BMI 25–29.9) | 26.5 | 25.0–29.9 | 2,937 | 2,345 | 1.04 | 0.99, 1.09 | 1.02 | 0.98, 1.08 | 1.00 | 0.95, 1.05 |
| Obese (BMI ≥30) | 31.6 | 30.0–54.1 | 437 | 339 | 1.27 | 1.14, 1.42 | 1.22 | 1.10, 1.37 | 1.16 | 1.04, 1.29 |
*
Weight (kg)/height (m)2.
†
Results were adjusted for age at entry, gender, and smoking.
‡
Results were adjusted for age at entry, gender, smoking, and “active” activities (seven categories).
§
Results were adjusted for age at entry, gender, smoking, “active” activities (seven categories), and history of hypertension, angina, myocardial infarction, stroke, diabetes, arthritis, and cancer.
¶
RR, relative risk; CI, confidence interval.