Table 2.
Baseline demographics for all participants and subsequently randomized participants stratified by gender
| Total | Men | Women | Total Randomized | Men | Women | |
|---|---|---|---|---|---|---|
| Mean (SD) or Count (%) | Mean (SD) or Count (%) | Mean (SD) or Count (%) | Mean (SD) or Count (%) | Mean (SD) or Count (%) | Mean (SD) or Count (%) | |
| Participant Enrollment | ||||||
| Total Number of Participants | 1204 | 769 (63.9) | 435 (36.1) | 1098 | 719 (65.5) | 379 (34.5) |
| Site Enrollment | ||||||
| Stanford University (%) | 303 (25.2) | 188 (24.4) | 115 (26.4) | 280 (25.5) | 179 (24.9) | 101 (26.6) |
| University of Arizona (%) | 346 (28.7) | 232 (30.2) | 114 (26.2) | 314 (28.6) | 216 (30.0) | 98 (25.9) |
| St. Mary Medical Center (%) | 117 (9.7) | 74 (9.6) | 43 (9.9) | 106 (9.7) | 68 (9.5) | 38 (10.0) |
| St. Luke's Hospital (%) | 193 (16.0) | 132 (17.2) | 61 (14.0) | 177 (16.1) | 121 (16.8) | 56 (14.8) |
| Brigham and Women's Hospital (%) | 245 (20.3) | 143 (18.6) | 102 (23.4) | 221 (20.1) | 135 (18.8) | 86 (22.7) |
| Demographic Data | ||||||
| Age (y) | 50.7 (12.6) | 50.3 (12.7) | 51.5 (12.2) | 51.5 (12.2) | 51.0 (12.4) | 52.4 (11.7) |
| BMI (kg/m2) | 32.0 (7.3) | 31.3 (6.4)2 | 33.3 (8.6) | 32.2 (7.1) | 31.3 (6.1)2 | 34.0 (8.5) |
| Highest Grade Level (y) | 15.5 (2.6) | 15.6 (2.6) | 15.4 (2.6) | 15.5 (2.6) | 15.6 (2.6)1 | 15.3 (2.5) |
| Ethnicity | ||||||
| White (%) | 903 (75.0) | 590 (65.3)4 | 313 (34.7) | 835 (76.0) | 553 (76.9)4 | 282 (74.4) |
| Native American (%) | 20 (1.7) | 11 (1.4) | 9 (2.1) | 18 (1.6) | 10 (1.4) | 8 (2.1) |
| Asian Pacific Islander (%) | 72 (6.0) | 52 (6.8) | 20 (4.6) | 61 (5.6) | 47 (6.5) | 14 (3.7) |
| Black (%) | 119 (9.9) | 59 (7.7) | 60 (13.8) | 103 (9.4) | 54 (7.5) | 49 (12.9) |
| Hispanic (%) | 83 (6.9) | 54 (7.0) | 29 (6.7) | 76 (6.9) | 52 (7.2) | 24 (6.3) |
| Other (%) | 7 (0.6) | 3 (0.4) | 4 (0.9) | 5 (0.5) | 3 (0.4) | 2 (0.5) |
| Marital Status | ||||||
| Married (%) | 695 (57.7) | 505 (65.7)3 | 190 (43.7) | 634 (57.7) | 475 (66.1)3 | 159 (42.0) |
| Single (%) | 297 (24.7) | 174 (22.6) | 123 (28.3) | 262 (23.9) | 158 (22.0) | 104 (27.4) |
| Divorced (%) | 181 (15.0) | 87 (11.3) | 94 (21.6) | 171 (15.6) | 83 (11.5) | 88 (23.2) |
| Widowed (%) | 31 (2.6) | 3 (0.4) | 28 (6.4) | 31 (2.8) | 3 (0.4) | 28 (7.4) |
| Smoking | ||||||
| Current Smokers (%) | 152 (12.7) | 107 (13.9) | 45 (10.3) | 136 (12.5) | 98 (13.7) | 38 (10.1) |
| Alcohol Use | ||||||
| Consumption > 7 Servings/Week (%) | 161 (13.4) | 134 (17.7)2 | 27 (6.2) | 154 (14.2) | 130 (18.3)2 | 24 (6.4) |
| Servings/Week | 3.0 (4.6) | 3.7 (5.0) | 1.8 (3.3) | 3.1 (4.7) | 3.7 (5.1)2 | 1.8 (3.4) |
| Caffeine Use | ||||||
| Consumption > 14 Servings/Week (%) | 555 (46.1) | 375 (48.8)2 | 180 (41.4) | 510 (47.3) | 351 (49.9)1 | 159 (42.3) |
| Servings/Week | 17.8 (15.7) | 18.8 (16.2) | 15.9 (14.7) | 17.8 (15.5) | 18.9 (16.2)2 | 15.8 (14.0) |
| Self Report Sleep Time | ||||||
| Hours per Weeknight | 6.88 (1.25) | 6.84 (1.19) | 6.95 (1.33) | 6.87 (1.21) | 6.85 (1.17) | 6.90 (1.30) |
| Hours per Weekend Night | 7.57 (1.44) | 7.56 (1.37) | 7.61 (1.57) | 7.56 (1.42) | 7.55 (1.34) | 7.59 (1.55) |
1
P < 0.05 Men vs. Women;
2
P < 0.01 Men vs. Women;
3
P < 0.01 Difference in proportions in Marital Status between genders;
4
P < 0.01 Difference in proportions in Ethnicity between genders.