Research Article
Sleep Duration and Breast Cancer Phenotype
Table 1
Patient characteristics by category of average hours of sleep.
| | | All () | Less than 6 hours of sleep/night () | 6 to less than 7 hours of sleep/night () | 7 or more hours of sleep per night () | |
| | Age, mean (SD) | 58.0 (11.4) | 57.8 (11.0) | 57.3 (11.1) | 58.4 (11.6) | 0.44 | | Postmenopausal, (%) | | | | | 0.87 | | Yes | 817 (84.1%) | 88 (10.8%) | 190 (23.3%) | 539 (66.0%) | | | No | 155 (16.0%) | 17 (11.0%) | 33 (21.3%) | 105 (67.7%) | | | Race, (%) | | | | | <0.0001 | | Caucasian | 831 (85.5%) | 74 (70.5%) | 183 (82.1%) | 574 (89.1%) | | | African American | 126 (13.0%) | 28 (26.7%) | 37 (16.6%) | 61 (9.5%) | | | Other | 15 (1.5%) | 3 (2.9%) | 3 (1.4%) | 9 (1.4%) | | | Body mass index, kg/m2, mean (SD) | 28.1 (6.5) | 29.4 (7.1) | 28.7 (7.3) | 27.7 (6.1) | 0.015 | | Physical activity per week, hours, mean (SD) | 4.0 (4.1) | 3.6 (4.6) | 4.1 (4.3) | 4.0 (3.9) | 0.55 | | Current alcohol use, (%) | | | | | <0.0001 | | Yes | 473 (48.7%) | 30 (71.4%) | 91 (40.8%) | 352 (54.7%) | | | No | 499 (51.3%) | 75 (28.6%) | 132 (59.2%) | 292 (45.3%) | | | Current HRT user, (%) | | | | | 0.63 | | Yes | 143 (14.7%) | 16 (15.2%) | 37 (16.6%) | 90 (14.0%) | | | No | 829 (85.3%) | 89 (84.8%) | 186 (83.4%) | 554 (86.0%) | | | Stage, (%) | | | | | 0.30 | | 0 (DCIS) | 199 (20.5%) | 24 (22.9%) | 46 (20.6%) | 129 (20.0%) | | | 1 | 395 (40.6%) | 37 (35.2%) | 79 (35.4%) | 279 (43.3%) | | | 2 | 278 (28.6%) | 31 (29.5%) | 68 (30.5%) | 179 (27.8%) | | | 3 | 62 (6.4%) | 8 (7.6%) | 21 (9.4%) | 33 (5.1%) | | | 4 | 21 (2.2%) | 3 (2.9%) | 5 (2.2%) | 13 (2.0%) | | | Missing | 17 (1.7%) | 2 (1.9%) | 4 (1.8%) | 11 (1.7%) | | | Grade, (%) | | | | | 0.40 | | 1 | 145 (14.9%) | 10 (9.5%) | 30 (13.5%) | 105 (16.3%) | | | 2 | 309 (31.8%) | 35 (33.3%) | 68 (30.4%) | 206 (32.0%) | | | 3 | 209 (21.5%) | 23 (21.9%) | 53 (23.8%) | 133 (20.7%) | | | Missing | 309 (31.8%) | 37 (35.2%) | 72 (32.3%) | 200 (31.1%) | | | ER status | | | | | 0.0064 | | Positive | 734 (75.5%) | 83 (79.0%) | 155 (69.5%) | 496 (77.0%) | | | Negative | 173 (17.8%) | 15 (14.3%) | 56 (25.1%) | 105 (16.3%) | | | Unknown/not done/missing | 65 (6.7%) | 7 (6.7%) | 12 (5.4%) | 46 (7.1%) | | | HER2 status | | | | | 0.38 | | Positive | 135 (13.9%) | 17 (16.2%) | 34 (15.2%) | 84 (13.0%) | | | Negative | 599 (61.6%) | 57 (54.3%) | 135 (60.5%) | 407 (63.2%) | | | Unknown/not done/missing | 238 (24.5%) | 31 (29.5%) | 54 (24.2%) | 153 (23.8%) | |
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value of ANOVA (for continuous variables) or chi-square (for categorical variables) test; HRT: hormone replacement therapy.
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