Table 1 Characteristics of study participants.
From: Association of short sleep duration and trabecular bone score
Characteristic | Sleep duration at night | ||||||
|---|---|---|---|---|---|---|---|
≦5 h N = 677 | 6 h N = 1008 | 7 h N = 1190 | 8 h N = 1240 | ≧9 h N = 365 | Total N = 4480 | P-value | |
Continuous variables* | |||||||
Age (years)** | 47.90(17.91) | 48.12(17.95) | 46.97(17.75) | 49.44(20.00) | 50.81(22.46) | 48.36(18.91) | 0.002 |
BMI (kg m−2)*** | 30.19(7.59) | 29.14(6.76) | 28.23(5.79) | 28.34(6.40) | 28.58(8.66) | 28.79(6.76) | < 0.001 |
CRP (mg/dL)** | 0.51(0.70) | 0.48(0.84) | 0.42(0.86) | 0.51(0.88) | 0.59(0.89) | 0.49(0.84) | 0.008 |
Fasting Glucose (mg/dL) | 106.11(34.85) | 105.07(35.09) | 101.67(22.52) | 105.96(36.63) | 107.44(40.93) | 104.84(33.40) | 0.124 |
Total spine BMD | 1.0452(0.15425) | 1.0460(0.15749) | 1.0395(0.14507) | 1.0413(0.15007) | 1.0199(0.16346) | 1.0409(0.15215) | 0.222 |
TBS** | 1.3530(0.15188) | 1.3680(0.14736) | 1.3851(0.13486) | 1.3740(0.13972) | 1.3609(0.14900) | 1.3716(0.14311) | 0.001 |
Categorical variablesa | |||||||
Male** | 344(50.8) | 497(49.3) | 581(48.8) | 586(47.3) | 142(38.9) | 2150(48.0) | 0.004 |
Race-ethnicity*** | < 0.001 | ||||||
Mexican American | 124(18.3) | 196(19.4) | 238(20.0) | 282(22.7) | 69(18.9) | 909(20.3) | |
Other Hispanic | 21(3.1) | 32(3.2) | 46(3.9) | 33(2.7) | 6(1.6) | 138(3.1) | |
Non-Hispanic White | 258(38.1) | 448(44.4) | 666(56.0) | 682(55.0) | 202(55.3) | 2256(50.4) | |
Non-Hispanic Black | 246(36.3) | 288(28.6) | 193(16.2) | 202(16.3) | 72(19.7) | 1001(22.3) | |
Snorting/ stop breathing *** | 160(26.6) | 224(24.3) | 189(17.1) | 194(17.2) | 56(17.0) | 823(20.2) | < 0.001 |
Coronary heart disease | 33(4.9) | 43(4.3) | 28(2.4) | 58(4.7) | 13(3.6) | 175(3.9) | 0.056 |
Cancer/Malignancy** | 47(6.9) | 68(6.7) | 99(8.3) | 111(9.0) | 46(12.6) | 371(8.3) | 0.001 |
Smoking | 341(50.4) | 488(48.4) | 542(45.5) | 579(46.7) | 171(46.8) | 2121(47.3) | 0.464 |
