Table 3.

Multiple Regression Analysis Examining Unique Contribution of Sleep Problems to HbA_1c

Predictors	β	t	P
Comorbid cardiovascular disease	–0.21	−1.68	.10
Age	–0.08	–0.72	.48
Gender	0.12	1.02	.31
Sleep problemsa	0.27	2.44	.02

^aSleep problems = score for item 3 (ie, “Trouble falling or staying sleep, or sleeping too much” on the 9-item Patient Health Questionnaire self-report depression measure).

Abbreviation: HbA_1c = hemoglobin A_1c.