Table 2.
Distribution of Study Population by Sleep Duration and Carotid CIMT among Women
| Demographics | Overall (%) | Mean Sleep Duratio n (hours) (SD) (N=357) |
P- value* |
Mean Carotid CIMT (mm) (SD) (N=357) |
P- value* |
|---|---|---|---|---|---|
| All participants (N=357) | 6.3(1.0) | 0.68(0.12) | |||
| Age | |||||
| 37 – 41 years | 21.3 | 6.2(1.0) | 0.76 | 0.64(0.09) | <0.01 |
| 42 – 46 years | 29.7 | 6.5(1.0) | 0.66(0.12) | ||
| 47 – 52 years | 49.0 | 6.3(0.9) | 0.70(0.13) | ||
| Race | |||||
| Black | 48.5 | 5.9(0.9) | <0.01 | 0.71(0.13) | <0.01 |
| White | 51.5 | 6.7(0.8) | 0.65(0.11) | ||
| Education | |||||
| Less than high school degree | 4.2 | 5.7(0.6) | <0.01 | 0.71(0.15) | <0.01 |
| High school degree | 17.7 | 6.2(1.1) | 0.70(0.14) | ||
| Some college | 27.5 | 6.1(1.0) | 0.71(0.14) | ||
| College graduate | 50.7 | 6.5(0.9) | 0.65(0.10) | ||
| Covariates | |||||
| Body mass index | |||||
| ≥30 kg/m2 (obese) | 36.2 | 6.1(0.9) | <0.01 | 0.72(0.13) | <0.01 |
| 25 – 29.9 kg/m2 (overweight) | 25.0 | 6.3(1.0) | 0.69(0.12) | ||
| <25 kg/m2 (normal) | 36.2 | 6.6(0.9) | 0.63(0.11) | ||
| Waist circumference | |||||
| >90 cm | 34.8 | 6.2(1.0) | 0.01 | 0.72(0.13) | <0.01 |
| ≤90 cm | 65.2 | 6.4(0.9) | 0.66(0.11) | ||
| Systolic blood pressure | |||||
| >120 mmHg | 25.8 | 6.2(1.0) | 0.04 | 0.73(0.12) | <0.01 |
| ≤120 mmHg | 74.2 | 6.4(0.9) | 0.66(0.12) | ||
| Diastolic blood pressure | |||||
| >80 mmHg | 21.4 | 6.09(1.0) | 0.02 | 0.72(0.12) | <0.01 |
| ≤80 mmHg | 78.7 | 6.37(1.0) | 0.67(0.12) | ||
| High-density lipoprotein cholesterol | |||||
| <52 mg/dL (below median) | 33.8 | 6.1(1.0) | 0.01 | 0.70(0.11) | 0.05 |
| ≥52 mg/dL (above median) | 66.2 | 6.4(0.9) | 0.67(0.13) | ||
| Low-density lipoprotein cholesterol | |||||
| >109 mg/dL (above median) | 47.3 | 6.4(0.9) | 0.23 | 0.70(0.13) | <0.01 |
| ≤109 mg/dL (below median) | 52.7 | 6.3(0.9) | 0.70(0.11) | ||
| Diabetes | |||||
| Yes | 8.4 | 6.2(0.9) | 0.10 | 0.76(0.15) | <0.01 |
| No | 91.6 | 6.3(1.0) | 0.67(0.12) | ||
| Alcohol | |||||
| >7 drinks/week | 19.5 | 6.7(0.9) | <0.01 | 0.67(0.13) | <0.01 |
| 1–7 drinks/week | 45.0 | 6.5(1.0) | 0.67(0.12) | ||
| Non-drinker | 35.5 | 6.2(0.9) | 0.70(0.13) | ||
| Smoking | |||||
| Current smoker | 30.6 | 6.0(1.0) | 0.01 | 0.71(0.14) | 0.01 |
| Former smoker | 44.6 | 6.4(0.9) | 0.70(0.13) | ||
| Never smoker | 24.9 | 6.6(0.9) | 0.64(0.11) | ||
| Depression (mean CES-D) | |||||
| CES-D≥16 | 22.0 | 6.0(1.1) | <0.01 | 0.68(0.12) | 0.19 |
| CES-D<16 | 78.0 | 6.4(0.9) | 0.68(0.12) | ||
Abbreviations: CIMT, intima-media thickness
*
p-values reflect t-test or ANOVA test for those with 3 or more categories