Baseline characteristics of WBF population (1304 participants) and those with complete adherence data by having had a colonoscopy prior to or within 90 days after the last count of unused cereal boxes (1208 participants)
| Variable . | 1304 participants . | 1208 participants . | ||
|---|---|---|---|---|
| Age (yrs), mean ± SD | 66.6 ± 8.8 | 66.6 ± 8.8 | ||
| Body mass index (kg/m2), mean ± SD | 26.5 ± 4.3 | 26.5 ± 4.3 | ||
| n (%) | n (%) | |||
| Group | ||||
| Low-fiber | 584 (44.8) | 562 (46.5) | ||
| High-fiber | 720 (55.2) | 646 (53.5) | ||
| Gender | ||||
| Female | 432 (33.1) | 393 (32.5) | ||
| Male | 872 (66.9) | 815 (67.5) | ||
| Race | ||||
| White | 1251 (95.9) | 1157 (95.8) | ||
| Other | 53 (4.1) | 51 (4.2) | ||
| Marital Status | ||||
| Married or cohabitating | 1088 (83.4) | 1005 (83.2) | ||
| Single | 215 (16.5) | 202 (16.7) | ||
| Education | ||||
| Some or all high-school | 592 (45.4) | 548 (45.4) | ||
| At least 1 year college | 710 (54.5) | 658 (54.5) | ||
| History of colorectal cancer in one parent or sibling | ||||
| Yes | 220 (16.9) | 209 (17.3) | ||
| No | 1084 (83.1) | 999 (82.7) | ||
| History of cancer other than colorectal cancer at least 5 years prior to study entry | ||||
| Yes | 85 (6.5) | 72 (6.0) | ||
| No | 829 (63.6) | 773 (64.0) | ||
| Years on study | ||||
| ≤1.0 | 47 (3.6) | 43 (3.6) | ||
| 1.1–2.0 | 127 (9.7) | 104 (8.6) | ||
| 2.1–3.0 | 258 (19.8) | 239 (19.8) | ||
| >3.0 | 872 (66.9) | 822 (68.1) | ||
| Polyp Characteristics | ||||
| History of adenomas prior to baseline colonoscopy | ||||
| Yes | 452 (34.7) | 419 (34.7) | ||
| No | 701 (53.8) | 654 (54.1) | ||
| Polyp Location | ||||
| Distal only | 710 (54.7) | 659 (54.8) | ||
| Proximal only | 350 (27.0) | 322 (26.8) | ||
| Proximal and distal | 238 (18.3) | 221 (18.4) | ||
| Number of polyps | ||||
| One | 745 (57.3) | 693 (57.5) | ||
| Two | 290 (22.3) | 261 (21.7) | ||
| Three or more | 266 (20.5) | 251 (20.8) | ||
| Maximum polyp size | ||||
| <0.5 cm | 400 (30.7) | 363 (30.1) | ||
| 0.60–1.00 cm | 546 (41.9) | 512 (42.4) | ||
| >1.00 cm | 358 (27.5) | 333 (27.6) | ||
| Lifestyle Variables | ||||
| Exercise | ||||
| At least once a week | 636 (55.4) | 612 (55.4) | ||
| Never | 512 (44.6) | 492 (44.6) | ||
| Current smoker | ||||
| Yes | 178 (13.7) | 152 (12.6) | ||
| No | 1126 (86.4) | 1056 (87.4) | ||
| Ever smoker | ||||
| Yes | 683 (52.4) | 637 (52.7) | ||
| No | 449 (34.4) | 424 (35.1) | ||
| 10-yr history of regular aspirin use | ||||
| Yes | 368 (28.2) | 345 (28.6) | ||
| No | 936 (71.8) | 863 (71.4) | ||
| Dietary variables, mean ± SD | ||||
| Energy (kcal/day) | 1909.3 ± 666.0 | 1903.6 ± 663.7 | ||
| Protein (g/day) | 73.4 ± 26.2 | 73.4 ± 26.3 | ||
| Carbohydrate (g/day) | 233.8 ± 87.4 | 233.5 ± 86.6 | ||
| Fat (g/day) | 72.9 ± 33.3 | 72.5 ± 33.3 | ||
| Dietary fiber (g/day) | 18.7 ± 8.2 | 18.8 ± 8.1 | ||
| Dietary calcium (mg/day) | 852.7 ± 377.7 | 852.7 ± 379.0 | ||
| Total calcium (mg/day) | 975.3 ± 441.8 | 977.2 ± 444.2 | ||
| Alcohol (g/day) | 7.5 ± 15.3 | 7.4 ± 14.8 | ||
| Dietary folate (μg/day) | 283.3 ± 120.5 | 284.4 ± 120.6 | ||
| Total folate (μg/day) | 441.4 ± 253.1 | 443.4 ± 249.9 | ||
| Red meat (g/day) | 62.5 ± 48.9 | 62.4 ± 49.4 | ||
| Variable . | 1304 participants . | 1208 participants . | ||
|---|---|---|---|---|
| Age (yrs), mean ± SD | 66.6 ± 8.8 | 66.6 ± 8.8 | ||
| Body mass index (kg/m2), mean ± SD | 26.5 ± 4.3 | 26.5 ± 4.3 | ||
| n (%) | n (%) | |||
| Group | ||||
| Low-fiber | 584 (44.8) | 562 (46.5) | ||
| High-fiber | 720 (55.2) | 646 (53.5) | ||
| Gender | ||||
| Female | 432 (33.1) | 393 (32.5) | ||
| Male | 872 (66.9) | 815 (67.5) | ||
| Race | ||||
| White | 1251 (95.9) | 1157 (95.8) | ||
| Other | 53 (4.1) | 51 (4.2) | ||
| Marital Status | ||||
| Married or cohabitating | 1088 (83.4) | 1005 (83.2) | ||
| Single | 215 (16.5) | 202 (16.7) | ||
| Education | ||||
| Some or all high-school | 592 (45.4) | 548 (45.4) | ||
| At least 1 year college | 710 (54.5) | 658 (54.5) | ||
| History of colorectal cancer in one parent or sibling | ||||
| Yes | 220 (16.9) | 209 (17.3) | ||
| No | 1084 (83.1) | 999 (82.7) | ||
| History of cancer other than colorectal cancer at least 5 years prior to study entry | ||||
| Yes | 85 (6.5) | 72 (6.0) | ||
| No | 829 (63.6) | 773 (64.0) | ||
| Years on study | ||||
| ≤1.0 | 47 (3.6) | 43 (3.6) | ||
| 1.1–2.0 | 127 (9.7) | 104 (8.6) | ||
| 2.1–3.0 | 258 (19.8) | 239 (19.8) | ||
| >3.0 | 872 (66.9) | 822 (68.1) | ||
| Polyp Characteristics | ||||
| History of adenomas prior to baseline colonoscopy | ||||
| Yes | 452 (34.7) | 419 (34.7) | ||
| No | 701 (53.8) | 654 (54.1) | ||
| Polyp Location | ||||
| Distal only | 710 (54.7) | 659 (54.8) | ||
| Proximal only | 350 (27.0) | 322 (26.8) | ||
| Proximal and distal | 238 (18.3) | 221 (18.4) | ||
| Number of polyps | ||||
| One | 745 (57.3) | 693 (57.5) | ||
| Two | 290 (22.3) | 261 (21.7) | ||
| Three or more | 266 (20.5) | 251 (20.8) | ||
| Maximum polyp size | ||||
| <0.5 cm | 400 (30.7) | 363 (30.1) | ||
| 0.60–1.00 cm | 546 (41.9) | 512 (42.4) | ||
| >1.00 cm | 358 (27.5) | 333 (27.6) | ||
| Lifestyle Variables | ||||
| Exercise | ||||
| At least once a week | 636 (55.4) | 612 (55.4) | ||
| Never | 512 (44.6) | 492 (44.6) | ||
| Current smoker | ||||
| Yes | 178 (13.7) | 152 (12.6) | ||
| No | 1126 (86.4) | 1056 (87.4) | ||
| Ever smoker | ||||
| Yes | 683 (52.4) | 637 (52.7) | ||
| No | 449 (34.4) | 424 (35.1) | ||
| 10-yr history of regular aspirin use | ||||
| Yes | 368 (28.2) | 345 (28.6) | ||
| No | 936 (71.8) | 863 (71.4) | ||
| Dietary variables, mean ± SD | ||||
| Energy (kcal/day) | 1909.3 ± 666.0 | 1903.6 ± 663.7 | ||
| Protein (g/day) | 73.4 ± 26.2 | 73.4 ± 26.3 | ||
| Carbohydrate (g/day) | 233.8 ± 87.4 | 233.5 ± 86.6 | ||
| Fat (g/day) | 72.9 ± 33.3 | 72.5 ± 33.3 | ||
| Dietary fiber (g/day) | 18.7 ± 8.2 | 18.8 ± 8.1 | ||
| Dietary calcium (mg/day) | 852.7 ± 377.7 | 852.7 ± 379.0 | ||
| Total calcium (mg/day) | 975.3 ± 441.8 | 977.2 ± 444.2 | ||
| Alcohol (g/day) | 7.5 ± 15.3 | 7.4 ± 14.8 | ||
| Dietary folate (μg/day) | 283.3 ± 120.5 | 284.4 ± 120.6 | ||
| Total folate (μg/day) | 441.4 ± 253.1 | 443.4 ± 249.9 | ||
| Red meat (g/day) | 62.5 ± 48.9 | 62.4 ± 49.4 | ||