Table 1.
Weighted means (SE) of the rest-activity rhythm parameters by population characteristics
| Characteristics | No. (%) of participants | Amplitude (MIMS/min) | Mesor (MIMS/min) | Acrophase, (hh:mm)a | Pseudo F-statistic | IS | IV |
|---|---|---|---|---|---|---|---|
| Total | 8200 | 13.85 (0.10) | 8.10 (0.05) | 14:42 (2.7) | 240.27 (4.82) | 0.366 (0.002) | 0.436 (0.001) |
| Sex | |||||||
| Women | 4224 (52.2) | 14.02 (0.11) | 8.17 (0.05) | 14:47 (2.5) | 271.62 (6.51) | 0.373 (0.002) | 0.424 (0.001) |
| Men | 3976 (47.8) | 13.67 (0.15) | 8.01 (0.08) | 14:36 (3.6) | 205.97 (4.50) | 0.359 (0.002) | 0.449 (0.002) |
| P | 0.053 | 0.062 | < 0.001 | < 0.001 | < 0.001 | < 0.001 | |
| Age group (years) | |||||||
| 20–39 | 2514 (31.8) | 15.35 (0.19) | 8.97 (0.11) | 15:22 (3.9) | 215.34 (5.28) | 0.358 (0.003) | 0.440 (0.002) |
| 40–59 | 2816 (38.9) | 14.29 (0.16) | 8.26 (0.08) | 14:25 (3.1) | 249.15 (6.49) | 0.368 (0.003) | 0.437 (0.002) |
| ≥ 60 | 2870 (29.2) | 11.63 (0.13) | 6.92 (0.08) | 14:21 (2.1) | 255.58 (8.43) | 0.374 (0.002) | 0.429 (0.002) |
| P | < 0.001 | < 0.001 | < 0.001 | < 0.001 | < 0.001 | 0.004 | |
| Race/ethnicity | |||||||
| Hispanic | 1744 (14.3) | 16.13 (0.19) | 9.34 (0.09) | 14:48 (3.9) | 219.07 (7.28) | 0.386 (0.003) | 0.418 (0.003) |
| NH-White | 3367 (67.3) | 13.50 (0.14) | 7.83 (0.07) | 14:35 (3.3) | 245.18 (6.65) | 0.368 (0.002) | 0.437 (0.002) |
| NH-Black | 1918 (11.0) | 13.07 (0.18) | 8.08 (0.10) | 15:00 (2.9) | 230.18 (4.31) | 0.337 (0.002) | 0.446 (0.002) |
| NH-Asian | 933 (4.7) | 14.13 (0.27) | 8.39 (0.16) | 15:05 (4.6) | 282.97 (9.93) | 0.365 (0.004) | 0.433 (0.004) |
| P | < 0.001 | < 0.001 | < 0.001 | < 0.001 | < 0.001 | < 0.001 | |
| Married or living with a partner | |||||||
| Yes | 4729 (62.5) | 14.03 (0.11) | 8.13 (0.06) | 14:31 (2.4) | 255.20 (6.53) | 0.432 (0.002) | 0.376 (0.002) |
| No | 3471 (37.5) | 13.55 (0.15) | 8.04 (0.08) | 15:00 (4.2) | 215.41 (3.63) | 0.442 (0.002) | 0.350 (0.002) |
| P | 0.007 | 0.316 | < 0.001 | < 0.001 | < 0.001 | < 0.001 | |
| Education | |||||||
| Less than high school | 1832 (15.9) | 14.56 (0.20) | 8.52 (0.11) | 14:35 (3.0) | 214.38 (7.09) | 0.431 (0.003) | 0.383 (0.003) |
| High school or equivalent | 1809 (21.3) | 14.37 (0.20) | 8.44 (0.11) | 14:33 (4.2) | 230.70 (10.17) | 0.432 (0.003) | 0.375 (0.003) |
| Some college or AA degree | 2486 (32.0) | 13.55 (0.19) | 7.96 (0.10) | 14:54 (5.4) | 226.18 (6.78) | 0.444 (0.002) | 0.359 (0.002) |
| College graduate or above | 2066 (30.8) | 13.55 (0.19) | 7.96 (0.10) | 14:54 (5.4) | 226.18 (6.78) | 0.444 (0.002) | 0.359 (0.002) |
| P | < 0.001 | < 0.001 | 0.18 | < 0.001 | < 0.001 | 0.001 | |
| Employed | |||||||
| Yes | 4324 (59.4) | 14.91 (0.16) | 8.61 (0.09) | 14:31 (3.0) | 257.35 (6.45) | 0.373 (0.002) | 0.432 (0.002) |
| No | 3871 (40.6) | 12.29 (0.12) | 7.35 (0.06) | 14:57 (2.4) | 215.19 (4.62) | 0.357 (0.002) | 0.441 (0.001) |
| P | < 0.001 | < 0.001 | < 0.001 | < 0.001 | < 0.001 | < 0.001 | |
| Poverty income ratio | |||||||
| ≥ 1 | 5815 (84.0) | 13.75 (0.12) | 8.00 (0.06) | 14:37 (2.4) | 247.67 (5.89) | 0.435 (0.002) | 0.367 (0.002) |
| < 1 | 1777 (16.0) | 14.24 (0.24) | 8.50 (0.11) | 15:12 (4.8) | 198.92 (7.24) | 0.443 (0.004) | 0.358 (0.004) |
| P | 0.091 | < 0.001 | < 0.001 | < 0.001 | 0.077 | 0.115 | |
All estimates accounted for complex survey design. Data are presented as number with weighted percentage (%) or weighted means with standard error (SE)
IS Interdaily stability, IV Intradaily variability, NH Non-Hispanic, SE Standard error
aClock hours (hh:mm) with standard error (minutes)