Categories of body mass index for Canadian inmates on admission and at follow-up
| Category | BMI range | Admission, no. (%) n = 1420 | Follow-up, no. (%) n = 1420 | p value |
|---|---|---|---|---|
| Underweight | < 18.5 | 17 (1.2) | F | < 0.0001* |
| Normal | 18.5–24.9 | 466 (32.8) | 222 (15.6) | |
| Overweight | 25.0–29.9 | 559 (39.4) | 551 (38.8) | |
| Obese | ≥ 30.0 | 378 (26.6) | 645 (45.4) | |
| Overweight and obese | ≥ 25 | 937 (66.0) | 1196 (84.2) | |
| Obesity class I | 30.0–34.9 | 236 (16.6) | 405 (28.5) | |
| Obesity class II | 35.0–39.9 | 92 (6.5) | 146 (10.3) | |
| Extreme obesity class III | ≥ 40.0 | 50 (3.5) | 94 (6.6) |
Note: BMI = body mass index, F = proportion too low to report and could threaten confidentiality.
↵* χ2 test; p < 0.05 considered significant.