Table 2.

Age and Gender effects on PSQI responses

	Gender		Regression			Race		Regression
	Male	Female	t stat	Pvalue	Δ	AI	MA	t stat	Pvalue	Δ
Sleep latency	28.4 ±1.8	27.9 ±1.1	−0.007	NS		34.3 ±2.4	25.9 ±1.0	−2.687	0.007	AI>MA
Sleep duration	7.3 ±0.09	7.5 ±0.08	1.709	NS		7.8 ±0.14	7.3 ±0.06	−3.001	0.003	AI>MA
Wake up at night	1.2 ±0.06	1.3 ±0.05	2.006	0.05	F>M	1.3 ±0.07	1.3 ±0.05	−0.19	NS
Cannot breathe comfortably	0.3 ±0.03	0.2 ±0.03	−2.36	0.02	M>F	0.2 ±0.04	0.2 ±0.02	0.304	NS
Cough or snore loudly	0.5 ±0.05	0.3 ±0.03	−3.974	0.0001	M>F	0.4 ±0.06	0.3 ±0.03	−2.073	0.04	AI>MA
Bad dreams	0.5 ±0.05	0.7 ±0.04	2.053	0.04	F>M	0.6 ±0.06	0.6 ±0.03	0.048	NS
PSQI total score	4.7 ±0.17	4.9 ±0.15	0.905	NS		4.9 ±0.24	4.7 ±0.13	−0.2	NS
Hours in bed	8.3 ±0.09	8.4 ±0.07	1.778	NS		8.7 ±0.13	8.2 ±0.06	−2.815	0.005	AI>MA
Bedtime >11pm	73% ±2.4	61% ±2.2	12.36 a	0.0001	F>M	62% ±3.3	68% ±1.9	7.96 a	0.005	MA>AI

Means ± standard error and regression statistics shown for PSQI items for gender (M=male, F=female) and race (AI= American Indian, MA= Mexican American) as predictor variables. Δ indicates statistically significant items on the PSQI, > indicates direction of difference.

^aValue is a Wald stat.