Table 3.

Backward Stepwise Regression Results for the Incidence of Insomnia Syndrome versus Steady Good Sleepers (N = 301)

Predictor	Odds Ratio Point Estimate	95% Confidence Limits		Wald χ2	P
Previous episode of insomnia	5.41	2.15	13.61	12.90	0.00
Family history of insomnia	2.96	1.20	7.30	5.57	0.02
Arousal Predisposition Scale (APS)	1.12	1.47	1.21	10.42	0.00
SF-12v2 Health Survey
General Health	0.97	0.95	0.99	5.09	0.02
Bodily Pain	0.98	0.96	0.99	4.67	0.03