Table 1.
MESA Sleep Participant Characteristics by Categories of Sleep Duration Regularity (N=2032)
| Overall | Sleep duration regularity (nightly within‐person SD) | P value | ||||
|---|---|---|---|---|---|---|
| ≤60 min | 61–90 min | 91–120 min | >120 min | |||
| n=696 | n=558 | n=420 | n=358 | |||
| Demographics | ||||||
| Age, y | 68.6±9.2 | 68.8±8.9 | 68.1±9.1 | 69.0±9.6 | 68.5±9.4 | 0.44 |
| Female sex, n (%) | 1090 (53.6) | 357 (51.3) | 320 (57.3) | 228 (54.3) | 185 (51.7) | 0.19 |
| Race and ethnicity, n (%) | <0.001 | |||||
| White | 770 (37.9) | 346 (49.7) | 197 (35.3) | 129 (30.7) | 98 (27.4) | |
| Chinese American | 226 (11.1) | 78 (11.2) | 53 (9.5) | 49 (11.7) | 46 (12.8) | |
| Black, African American | 561 (27.6) | 132 (19.0) | 153 (27.4) | 152 (36.2) | 124 (34.6) | |
| Hispanic American | 475 (23.4) | 140 (20.1) | 155 (27.8) | 90 (21.4) | 90 (25.1) | |
| Education, n (%) | 0.04 | |||||
| ≤HS graduate | 613 (30.2) | 188 (27.0) | 198 (35.5) | 122 (29.0) | 105 (29.3) | |
| Some college | 615 (30.3) | 204 (29.3) | 163 (29.2) | 137 (32.6) | 111 (31.0) | |
| College graduate plus | 800 (39.4) | 302 (43.4) | 197 (35.3) | 160 (38.1) | 141 (39.4) | |
| Average yearly income | <0.01 | |||||
| <$20 000 | 383 (18.8) | 101 (14.5) | 115 (20.6) | 85 (20.2) | 82 (22.9) | |
| $20 000 to <$50 000 | 502 (24.7) | 167 (24.0) | 139 (24.9) | 99 (23.6) | 97 (27.1) | |
| ≥$50 000 | 1086 (53.4) | 408 (58.6) | 290 (52.0) | 224 (53.3) | 164 (45.8) | |
| Work schedule, n (%) | 0.01 | |||||
| Do not work | 1148 (56.5) | 406 (58.3) | 295 (52.9) | 235 (56.0) | 212 (59.2) | |
| Day shift | 617 (30.4) | 213 (30.6) | 189 (33.9) | 134 (31.9) | 81 (22.6) | |
| Other shift | 246 (12.1) | 74 (10.6) | 68 (12.2) | 47 (11.2) | 57 (15.9) | |
| Lifestyle characteristics | ||||||
| Current smoker, n (%) | 142 (7.0) | 35 (5.0) | 35 (6.3) | 36 (8.6) | 36 (10.1) | 0.02 |
| Current alcohol consumer, n (%) | 881 (43.4) | 335(48.1) | 235 (42.1) | 177 (42.1) | 134 (37.4) | 0.02 |
| MVPA, MET min/wk | 5380±6220 | 5300±4850 | 5440±6120 | 5680±8320 | 5080±5890 | 0.39 |
| BMI, kg/m2 | 28.8±5.6 | 28.0±5.1 | 29.2±5.7 | 29.0±5.8 | 29.4±5.8 | <0.01 |
| Cardiovascular risk factors | ||||||
| Systolic blood pressure, mm Hg | 123.0±20.0 | 121.0±19.1 | 124.0±20.7 | 124.0±19.1 | 125.0±21.6 | 0.02 |
| Diastolic blood pressure, mm Hg | 68.3±9.8 | 67.3±9.5 | 68.6±9.9 | 68.7±9.2 | 69.4±10.8 | 0.01 |
| Antihypertensive medication use, n (%) | 1090 (53.6) | 358 (51.4) | 293 (52.5) | 230 (54.8) | 209 (58.4) | 0.18 |
| Statin medication use, n (%) | 775 (38.1) | 278 (39.9) | 200 (35.8) | 158 (37.6) | 139 (38.8) | 0.51 |
| LDL‐C, mg/dL | 106.0±32.4 | 105.0±31.3 | 108.0±31.4 | 107.0±35.3 | 105.0±32.7 | 0.39 |
| HDL‐C, mg/dL | 55.6±16.5 | 55.5±15.4 | 56.9±17.3 | 55.4±16.8 | 54.0±16.8 | 0.10 |
| Prevalent diabetes, n (%) | 397 (19.5) | 102 (14.7) | 100 (17.9) | 97 (23.1) | 98 (27.4) | <0.001 |
| Severe obstructive sleep apnea, n (%) | 386 (19.0) | 112 (16.1) | 102 (18.3) | 83 (19.8) | 89 (24.9) | 0.17 |
| Average sleep fragmentation | 20.2±7.0 | 18.8±6.6 | 20.1±7.0 | 20.9±6.6 | 22.0±7.8 | <0.001 |
Data presented as mean±SD unless specified. P values adjusted for multiple comparisons using false discovery rate method. BMI indicates body mass index; HDL‐C, high‐density lipoprotein cholesterol; HS, high school; LDL‐C, low‐density lipoprotein cholesterol; MESA, Multi‐Ethnic Study of Atherosclerosis; MET, metabolic equivalent; and MVPA, moderate to vigorous intensity physical activity.