Table 1 Weighted means (SE) of the rest-activity rhythm parameters by population characteristics

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)

 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

 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

 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

 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

 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

 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

  ≥ 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