TABLE 1.
Demographics by BMI Category
| Underweight (BMI <18.5 kg/m2; n = 1) | Normal (BMI = 18.5–24.99 kg/m2; n = 16) | Preobese (BMI = 25–29.99 kg/m2; n = 26) | Obese Class I (BMI = 30–34.99 kg/m2; n = 22) | Obese Class II (BMI = 35–39.99 kg/m2; n = 15) | Obese Class III (BMI >40 kg/m2; n = 6) | |
|---|---|---|---|---|---|---|
| Age, mean (SD; min-max), y | 61 (—; 61–61) | 56.5 (16.4; 21–84) | 54.1 (14.3; 28–84) | 57.9 (13.2; 20–79) | 53.4 (13.0; 35–76) | 56.3 (8.3; 41–66) |
| Sex | ||||||
| Male, n (%) | 0 | 8 (50.0) | 11 (42.3) | 8 (36.4) | 1 (6.7) | 0 |
| Female, n (%) | 1 (100) | 8 (50.0) | 15 (57.7) | 14 (63.6) | 14 (93.3) | 6 (100) |
| Race | ||||||
| White, n (%) | 1 (100) | 10 (62.5) | 18 (69.2) | 11 (50) | 7 (46.7) | 1 (16.7) |
| Black, n (%) | 0 | 3 (18.8) | 7 (26.9) | 11 (50) | 8 (53.3) | 5 (83.3) |
| Asian, n (%) | 0 | 3 (18.8) | 1 (3.8) | 0 | 0 | 0 |
| BMI, mean (SD; min-max), kg/m2 | 18.3 (—; 18.3–18.3) | 22.8 (1.3; 19.7–24.3) | 27.1 (1.2; 25.1–29.6) | 31.8 (1.6; 30–34.9) | 37.5 (1.4; 35–39.7) | 50 (8.9; 40.7–66.8) |
| Level | ||||||
| L3-L4 | 0 | 0 | 1 (3.8) | 0 | 4 (26.7) | 0 |
| L4-L5 | 1 (100) | 14 (87.5) | 19 (73.1) | 17 (77.3) | 10 (66.7) | 5 (83.3) |
| L5-S1 | 0 | 2 (12.5) | 6 (23.1) | 5 (22.7) | 1 (6.7) | 1 (16.7) |
BMI categories based on classifications by the World Health Organization.23
Min indicates minimum; max, maximum; %, percentage; L, lumbar intervertebral space.