Table 1.
Main characteristics of participants included in this study by dietary fiber intake
| Variables | Q1 (n = 17,360) | Q2 (n = 17,330) | Q3 (n = 17,322) | Q4 (n = 17,304) | Q5 (n = 17,326) | p |
|---|---|---|---|---|---|---|
| Age (years), mean (SD) | 62.1 (5.2) | 62.2 (5.2) | 62.1 (5.2) | 62.1 (5.2) | 62.1 (5.2) | 0.35 |
| Sex (n, %) | ||||||
| Female | 6579 (37.9%) | 7041 (40.6%) | 7661 (44.2%) | 8469 (48.9%) | 9931 (57.3%) | < 0.001 |
| Male | 10,781 (62.1%) | 10,289 (59.4%) | 9661 (55.8%) | 8835 (51.1%) | 7395 (42.7%) | |
| Arm (n, %) | ||||||
| Screen | 8747 (50.4%) | 8808 (50.8%) | 8686 (50.1%) | 8998 (52.0%) | 8968 (51.8%) | < 0.001 |
| Control | 8613 (49.6%) | 8522 (49.2%) | 8636 (49.9%) | 8306 (48.0%) | 8358 (48.2%) | |
| Smoking (n, %) | ||||||
| Never | 7998 (46.1%) | 8493 (49.0%) | 8664 (50.0%) | 8816 (51.0%) | 8698 (50.2%) | < 0.001 |
| Current | 2451 (14.1%) | 1726 (10.0%) | 1465 (8.5%) | 1249 (7.2%) | 1168 (6.7%) | |
| Former | 6909 (39.8%) | 7107 (41.0%) | 7192 (41.5%) | 7231 (41.8%) | 7457 (43.0%) | |
| Education (n, %) | ||||||
| ≤ High school | 8187 (47.2%) | 7393 (42.7%) | 7026 (40.6%) | 6765 (39.1%) | 6492 (37.5%) | < 0.001 |
| ≥ Some college | 9126 (52.6%) | 9911 (57.2%) | 10,272 (59.3%) | 10,494 (60.6%) | 10,801 (62.3%) | |
| BMI (n, %) | ||||||
| < 25.0 kg/m2 | 6169 (35.5%) | 6264 (36.1%) | 6217 (35.9%) | 6190 (35.8%) | 6155 (35.5%) | 0.75 |
| ≥ 25.0 kg/m2 | 10,942 (63.0%) | 10,842 (62.6%) | 10,879 (62.8%) | 10,903 (63.0%) | 10,944 (63.2%) | |
| Race (n, %) | ||||||
| White, Non-Hispanic | 15,530 (89.5%) | 15,932 (91.9%) | 16,071 (92.8%) | 16,045 (92.7%) | 15,703 (90.6%) | < 0.001 |
| Other | 1830 (10.5%) | 1398 (8.1%) | 1251 (7.2%) | 1259 (7.3%) | 1623 (9.4%) | |
| Marital status (n, %) | ||||||
| Married | 12,815 (73.8%) | 13,622 (78.6%) | 13,830 (79.8%) | 13,845 (80.0%) | 13,726 (79.2%) | < 0.001 |
| Not married | 4505 (26.0%) | 3685 (21.3%) | 3466 (20.0%) | 3412 (19.7%) | 3571 (20.6%) | |
y year, SD Standard deviation, BMI body mass index