Table 1.
Baseline characteristics of participants
| A. By body mass index (BMI)
| ||||
|---|---|---|---|---|
| Baseline characteristics | BMI < 25kg/m2 (N = 466) | BMI 25 – 29 kg/m2 (N = 868) | BMI ≥ 30kg/m2 (N = 492) | P value |
| Mean age (SD) | 61.1 (10.5) | 61.1 (9.5) | 60.8 (9.7) | 0.81 |
| Randomization assignment | ||||
| Control | 236 (50.6) | 434 (50.0) | 237 (48.2) | 0.72 |
| Intervention | 230 (49.4) | 434 (50.0) | 255 (51.8) | |
| Male | 226 (48.5) | 623 (71.8) | 331 (67.3) | <0.001 |
| Female | 240(51.5) | 245(28.2) | 161(32.7) | |
| Race | ||||
| Whites | 424 (91.0) | 781 (90.0) | 428 (87.0) | |
| Blacks | 25 (5.4) | 70 (8.1) | 55 (11.2) | 0.005 |
| Others* | 17 (3.7) | 17 (2.0) | 9 (1.8) | |
| Smoking status | ||||
| Never | 192 (41.2) | 322 (37.1) | 201 (40.9) | |
| Former | 183 (39.3) | 447 (51.5) | 243 (49.4) | <0.001 |
| Current | 91 (19.5) | 99 (11.4) | 48 (9.8) | |
| Positive family history of colorectal cancer | 116 (24.9) | 251 (28.9) | 122 (24.8) | 0.15 |
| Uses non-steroidal anti-inflammatory drugs at least once/month | 160 (34.3) | 268 (30.9) | 196 (39.8) | 0.004 |
| B. By weight change in 4 years
| ||||
|---|---|---|---|---|
| Baseline characteristics | No weight change (N = 727) | Lost weight (N = 557) | Gained weight (N = 542) | P value |
| Mean age (SD) | 61.3 (9.4) | 63.6 (9.3) | 58.0 (10.1) | 0.141 |
| Randomization assignment | ||||
| Control | 366 (40.4) | 233 (25.7) | 308 (34.0) | <0.001 |
| Intervention | 361 (39.3) | 324 (35.3) | 234 (25.5) | |
| Male | 454 (38.5) | 382 (32.4) | 344 (29.2) | 0.06 |
| Female | 273 (42.3) | 175 (27.1) | 198 (30.7) | |
| Race | ||||
| Whites | 647 (39.6) | 502 (30.7) | 484 (29.6) | |
| Blacks | 60 (40.0) | 45 (30.0) | 45 (30.0) | 0.862 |
| Others* | 20 (46.5) | 10 (23.3) | 13 (30.2) | |
| Smoking status | ||||
| Never | 299 (41.8) | 204 (28.5) | 212 (29.7) | |
| Former | 331 (37.9) | 295 (33.8) | 247 (28.3) | 0.024 |
| Current | 97 (40.8) | 58 (24.4) | 83 (34.9) | |
| Positive family history of colorectal cancer | 194 (39.7) | 139 (28.4) | 156 (31.9) | 0.357 |
| Uses non-steroidal anti-inflammatory drugs at least once/month | 237 (38.0) | 191 (30.6) | 196 (31.4) | 0.415 |
*
Others = Hispanics, Asians, Native Americans