Table 2.

Clinical determinants of length of hospital stay following acute myocardial infarction

Variable		Geometric mean length of stay (days)	95% CI	p Value for difference (adjusted)
Age (years)	<55	7.15	6.83 to 7.47	0.0001
	55–65	7.36	7.07 to 7.66
	65–75	7.75	7.39 to 8.12
	75+	8.64	8.14 to 9.17
Sex	Male	7.40	7.21 to 7.60	0.012
	Female	8.30	7.90 to 8.71
Year of admission	1988–90	11.01	10.60 to 11.44	<0.0001
	1991–93	7.79	7.48 to 8.11
	1994–96	7.12	6.83 to 7.42
	1997–99	6.45	6.18 to 6.74
Smoking	Never	7.52	7.22 to 7.84	0.13
	Ex	7.93	7.49 to 8.40
	Current	7.54	7.30 to 7.79
Diabetes	Yes	8.10	7.69 to 8.53	0.058
	No	7.48	7.28 to 7.68
Atrial fibrillation	Yes	9.93	9.16 to 10.76	0.0002
	No	7.39	7.21 to 7.57
Hypertension	Yes	7.80	7.47 to 8.14	0.12
	No	7.50	7.29 to 7.71
Stroke	Yes	12.87	9.02 to 18.36	<0.0001
	No	7.57	7.39 to 7.75
Ventricular fibrillation	Yes	9.79	8.75 to 10.95	0.012
	No	7.49	7.31 to 7.67
Left ventricular failure	Yes	9.72	9.26 to 10.21	<0.0001
	No	6.99	6.81 to 7.17
Peak creatinine kinase (IU/l)	<500	7.25	6.90 to 7.60	0.012
	500–1000	7.03	6.71 to 7.37
	1000–1500	7.88	7.57 to 8.21
	1500+	8.43	7.99 to 8.88

CI, confidence interval.