Table 2.
Baseline participant characteristics according to quartiles of baseline sedentary behavior
| Quartiles of sedentary time (hours per day) | ||||
|---|---|---|---|---|
| 1st (n=433) | 2nd (n=431) | 3rd (n=433) | 4th (n=431) | |
| 4.8 ± 1.3 | 7.6 ± 0.6 | 9.7 ± 0.7 | 12.6 ± 6.5 | |
| Baseline Characteristics1 | ||||
| Age (years) | 60.4 ± 9.4 | 65.4 ± 8.3 | 68.1 ± 7.4 | 69.4 ± 6.4 |
| Male | 294 (67.9) | 293 (68.0) | 294 (68.1) | 293 (68.0) |
| White | 393 (91.4) | 402 (94.4) | 418 (98.0) | 408 (95.6) |
| Current smoker | 59 (15.6) | 56 (13.0) | 47 (10.88) | 57 (13.2) |
| Family history CRC2 | 107 (25.2) | 100 (23.9) | 85 (20.6) | 110 (26.4) |
| Previous polyps3 | 135 (32.6) | 168 (39.9) | 198 (46.9) | 216 (51.6) |
| Aspirin use4 | 109 (25.2) | 109 (25.3) | 141 (32.6) | 155 (36.0) |
| Waist circumference (in), males | 39.6 ± 4.6 | 39.5 ± 4.3 | 39.6 ± 4.0 | 40.0 ± 4.4 |
| Waist circumference (in), females | 33.9 ± 5.7 | 33.7 ±5.5 | 34.2 ± 5.2 | 34.5 ± 4.9 |
| BMI (kg/m2) | 28.3 ± 5.1 | 27.9 ± 5.1 | 27.7 ± 4.2 | 28.1 ± 4.6 |
| BMI (kg/m2) categories | ||||
| Underweight or Normal <25 kg/m2 | 122 (28.5) | 112 (26.2) | 111 (25.8) | 108 (25.4) |
| Overweight 25 – <30 kg/m2 | 167 (39.0) | 199 (46.5) | 206 (47.8) | 186 (43.8) |
| Obese ≥30 kg/m2 | 136 (31.8) | 113 (26.4) | 112 (25.99) | 129 (30.4) |
| Dietary Intake | ||||
| Energy (kcal/d) | 2005.2 ±800 | 1974 ± 790 | 1938 ± 706 | 1939 ± 806 |
| Protein (g/d) | 76.2 ± 31.4 | 73.9 ± 30.5 | 71.6 ± 26.1 | 71.3 ± 29.6 |
| Total fat (g/d) | 66.9 ± 32.3 | 66.4 ± 31.6 | 63.7 ± 28.6 | 63.4 ± 31.2 |
| Saturated fat (g/d) | 21.8 ± 11.4 | 20.8 ± 11.3 | 20.8 ± 10.5 | 20.8 ± 11.5 |
| Total fiber (g/d) | 22.7 ± 10.8 | 22.9 ± 10.9 | 21.6 ± 9.9 | 21.9 ± 11.0 |
| Calcium (mg/d) | 958.92 ± 445.4 | 981.1 ± 483.71 | 949.7 ± 440.8 | 950.1 ±452.9 |
| Alcohol (g/d), median [25%ile, 75%ile] | 1.8 [0.0, 9.7] | 1.8 [0.0, 12.1] | 1.7 [0.0, 12.3] | 1.1 [0.0, 9.2] |
| Colorectal Adenoma characteristics | ||||
| Multiple adenomas (3+) | 67 (15.5) | 72 (16.7) | 69 (16.0) | 80 (18.6) |
| Large (≥1cm) | 162 (37.4) | 168 (39.0) | 193 (44.7) | 178 (41.4) |
| Villous architecture | 99 (22.9) | 88 (20.4) | 87 (20.1) | 87 (20.3) |
| Proximal location | 179 (42.1) | 218 (52.0) | 221 (52.3) | 258 (61.9) |
Abbreviations: CRC, Colorectal Cancer; BMI, Body Mass Index
Continuous variables are summarized with mean and standard deviation, unless otherwise noted. Categorical variables are summarized with counts and percent of non-missing total. Numbers may not add up to the total due to missing data. Data are missing for race/ethnicity (n=17), family history of colorectal cancer (n=56), previous polyps (n=51), large adenoma at baseline (n=1), villous architecture (n=2), proximal location (n=43), body mass index (n=15), and waist circumference (n=16).
Colorectal cancer in one or more first-degree relatives
History of colorectal polyps prior to qualifying colonoscopy
Regular use of aspirin four weeks prior to enrollment