Table 1.
Study population characteristics
| Variable | N (%) or median (IQR) |
BMI (kg/m2) | ||||
| <25* | 25–29.9 | 30–34.9 (I)† | 35–39.9 (II)† | ≥40 (III)† | ||
| All subjects | 324 199 (100.0%) | 68 424 (21.1%) | 121 287 (37.4%) | 75 199 (23.2%) | 34 152 (10.5%) | 25 137 (7.8%) |
| Age (years)‡ | 52 (40–63) | 48 (32–61) | 54 (42–65) | 54 (43–64) | 52 (41–62) | 49 (38–59) |
| Weight (lbs)‡ | 185 (155–218) | 133 (120–148) | 177 (160–194) | 207 (188–227) | 234 (214–257) | 278 (250–310) |
| Gender (n, column %; row %) | ||||||
| Male | 150 458 (46.4%) | 20 340 (29.7%) (13.5%) |
66 164 (54.6%) (44.0%) |
40 092 (53.3%) (26.6%) |
15 116 (44.3%) (10.0%) |
8746 (34.8%) (5.8%) |
| Female | 173 736 (53.6%) | 48 083 (70.3%) (27.7%) |
55 121 (45.4%) (31.2%) |
35 107 (46.7%) (20.2%) |
19 034 (55.7%) (11.0%) |
16 391 (65.2%) (9.4%) |
| Missing | 5 (0.0%) | |||||
| Race (n, column %; row %) | ||||||
| Caucasian (non-Hispanic) | 251 028 (77.4%) | 54 534 (81.4%) (21.7%) |
95 779 (80.1%) (38.2) |
57 548 (77.4%) (22.9%) |
25 392 (75.0%)
(10.1%) |
17 775 (71.2%) (7.1%) |
| African-American | 41 789 (12.9%) | 5193 (7.7%) (12.4%) |
13 253 (11.1%) (31.7%) |
11 242 (15.1%) (26.8%) |
6264 (18.5%) (15.0%) |
5837 (23.4%) (14.0%) |
| Hispanic | 11 799 (3.6%) | 3425 (5.1%) (29.0%) |
4586 (3.8%) (38.9%) |
2387 (3.2%) (20,1%) |
913 (2.7%) (7.7%) |
488 (2.0%) (4.1%) |
| Asian/Pacific Islander | 4670 (1.4%) | 2222 (3.3%) (47.6%) |
1759 (1.5%) (37.7%) |
505 (0.7%) (10.8%) |
130 (0.4%) (2.8%) |
54 (0.2%) (1.2%) |
| Other | 10 449 (3.2%) | 1661 (2.5%) (15.9%) |
4158 (3.5%) (39.8%) |
2663 (3.6%) (25.5%) |
1144 (3.4%) (10.9%) |
823 (3.3%) (7.9%) |
| Missing | 4464 (1.4%) | |||||
| Smoking status (n, column %; row %) | ||||||
| Current | 48 128 (14.8%) | 11 295 (16.6%) (23.5%) |
17 071 (14.1%) (35.5%) |
11 019 (14.7%) (22.9%) |
4987 (14.6%) (10.4%) |
3756 (15.0%) (7.8%) |
| Former | 96 633 (39.8%) | 15 214 (22.3%) (15.7%) |
37 899 (31.3%) (39.2%) |
24 607 (32.8%) (25.5%) |
11 094 (32.6%) (11.5%) |
7819 (31.2%) (8.1%) |
| Never | 178 677 (55.1%) | 41 707 (61.1%) (23.3%) |
66 081 (54.6%) (37.0%) |
39 404 (52.5%) (22.1%) |
17 996 (52.8%) (10.1%) |
13 489 (53.8%) (7.5%) |
| Missing | 761 (0.2%) | |||||
| Median household income‡ (US$) | 59 420 (43 640–79 680) |
62 210 (47 280–82 120) |
62 500 (45 440–83 280) |
58 300 (42 660–77 790) |
53 890 (39 710–73 040) |
49 940 (35 690–66 320) |
| Missing (n, %) | 4319 (1.3%) | |||||
| ICD-9 code for obesity (%)§ | 76 777 (23.7%) | 145b(0.2%) | 12 576 (10.4%) | 26 185 (34.8%) | 18 934 (55.4%) | 18 937 (75.3%) |
| 278.0x only | 67 848 (88.4%) | 136 (93.8%) | 11 817 (94.0%) | 21 477 (82.0%) | 16 034 (84.7%) | 18 384 (97.1%) |
| V85.3x or V85.4x | 3519 (4.6%) | 7 (4.8%) | 381 (3.0%) | 2162 (8.3%) | 878 (2.5%) | 91 (0.5%) |
| 278.0x & V85.3x or V85.4x |
5410 (7.0%) | 2 (1.4%) | 378 (3.0%) | 2546 (9.7%) | 2022 (10.7%) | 462 (2.4%) |
V85 codes indicate the extent of obesity; that is, V85.3x=BMI 30–39.9, V85.4x=BMI ≥ 40.
All measured associations between the weight classifications and the patient characteristics were statistically significant with a P value<0.0001.
*0.2% of subjects had ICD-9 codes for obesity for a median of 2.6 years prior to 1 July 2015.
†Obesity class.
‡Median (IQR).
§ICD-9 codes indicating obesity diagnosis.
BMI, body mass index; ICD-9, International Classification of Diseases, Ninth Revision.