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Logo of nihpaAbout Author manuscriptsSubmit a manuscriptHHS Public Access; Author Manuscript; Accepted for publication in peer reviewed journal;
 
From:
Psychosom Med. Author manuscript; available in PMC 2010 June 18.
Published in final edited form as:
Psychosom Med. 2008 May; 70(4): 410–416.
doi: 10.1097/PSY.0b013e31816fdf21

TABLE 2

Unadjusted Means of Actigraphy and Polysomnography Measures Among Blacks and Whites/Asians and β Coefficients for Race and Composite SES

Unadjusted Mean ± SD
White/Asian
Composite SES
BlackWhite/Asianβpβp
Duration (hr)
 Actigraphy5.4 ± 0.836.0 ± 0.900.44<.001−0.11.13
 PSG5.8 ± 1.086.2 ± 0.930.25.001−0.06.46
Sleep continuity latency (min)
 Actigraphy25.4 ± 23.716.3 ± 19.2−0.25.001−0.17.03
 PSG40.7 ± 40.226.1 ± 26.7−0.15.06−0.11.18
Efficiency (%)
 Actigraphy77.4 ± 9.682.1 ± 8.5−0.30<.001−0.10.19
 PSG73.6 ± 11.878.7 ± 9.8−0.23.003−0.13.08
WASO (min)
 PSG86.9 ± 47.877.3 ± 45.2−0.09.22−0.19.01
Sleep architecture (%)
 Stage 19.6 ± 6.210.2 ± 6.20.02.81−0.12.10
 Stage 265.1 ± 8.060.3 ± 8.2−0.29<.001−0.01.98
 Stage 3 to 43.4 ± 5.06.8 ± 7.00.34<.0010.07.32
 REM21.9 ± 5.022.6 ± 5.30.10.210.03.70
Sleep disordered breathing
 Apnea/Hypopnea Index14.8 ± 17.912.8 ± 13.1−0.10.190.01.99

Note: Reported β coefficients are from analyses adjusted for age, sex, and medication use. Race coded +1 for White/Asian and 0 for Black.

β coefficients for actigraphy and PSG-measured sleep efficiency are reversed due to data transformations.

SES = socioeconomic status; SD = standard deviation; PSG = polysomnography; WASO = wake after sleep onset; REM = rapid eye movement.