. Author manuscript; available in PMC: 2013 Jun 1.

Published in final edited form as: Sleep Med. 2012 Mar 31;13(6):728–731. doi: 10.1016/j.sleep.2012.01.015

Table 1.

Comparison of sociodemographic and health data of Black and White Americans participating in the 2005 National Health Interview Survey.

Variable	Black Americans (15%)	White Americans (85%)	F/χ²	P-value
Age (mean ± SD)	45.56 ±16.91	48.02 ± 18.02	72	0.0001
Female sex (%)	61	56	52	0.0001
Income >$35,000 (%)	16	24	140	0.0001
Body mass index (% obese)	52	38	193	0.0001
Hypertension (%)	36	27	133	0.0001
Diabetes (%)	12	8	62	0.0001
Heart disease (%)	6	8	29	0.0001
Arthritis (%)	22	24	11	0.0001

SD, standard deviation.