Table 3. Adjusted inpatient mortality among patients admitted with AMI to teaching-intensive and non-teaching intensive hospitals, according to month of admission.

	Adjusted mortality among low risk patients				Adjusted mortality among high risk patients
Month	Teaching-intensive	Non-teaching-intensive	Odds ratio (95% CI)	p-value of OR compared to May	Teaching-intensive	Non-teaching-intensive	Odds ratio (95% CI)	p-value of OR compared to May
January	2.1%	2.8%	0.72 (0.55 - 0.90)	0.73	20.4%	25.0%	0.75 (0.64 - 0.86)	0.55
February	2.6%	2.9%	0.89 (0.71 - 1.07)	0.24	21.8%	24.1%	0.87 (0.74 - 1.00)	0.35
March	2.0%	2.8%	0.71 (0.56 - 0.86)	0.59	18.5%	22.9%	0.74 (0.62 - 0.86)	0.59
April	2.1%	2.8%	0.74 (0.53 - 0.94)	0.80	19.7%	23.3%	0.79 (0.66 - 0.92)	0.97
May	2.1%	2.7%	0.76 (0.60 - 0.97)	-	18.9%	22.5%	0.79 (0.68 - 0.91)	-
June	2.1%	2.6%	0.81 (0.63 - 0.98)	0.69	20.9%	23.4%	0.85 (0.72 - 0.98)	0.42
July	1.9%	2.9%	0.64 (0.48 - 0.80)	0.23	22.9%	22.8%	1.00 (0.86 - 1.15)	0.02
August	2.1%	2.6%	0.78 (0.62 - 0.95)	0.88	20.1%	23.1%	0.82 (0.69 - 0.95)	0.70
September	1.8%	2.5%	0.71 (0.55 - 0.86)	0.63	20.6%	22.5%	0.89 (0.76 - 1.02)	0.24
October	2.1%	2.8%	0.73 (0.58 - 0.88)	0.74	21.9%	22.9%	0.94 (0.80 - 1.07)	0.05
November	2.3%	2.6%	0.86 (0.66 - 1.05)	0.43	21.2%	22.8%	0.90 (0.76 - 1.05)	0.21
December	1.9%	2.8%	0.68 (0.53 - 0.83)	0.45	20.7%	23.0%	0.86 (0.74 - 0.97)	0.31

Notes: Odds ratio reflects comparison of mortality between teaching-intensive and non-teaching intensive hospitals. P-value reflects comparison of mortality odds ratio in teaching-intensive versus non-teaching-intensive hospitals in a given month, relative to May. For example, the mortality odds ratio between teaching-intensive and non-teaching intensive hospitals in July is compared to the identical odds ratio in May, which is defined as the ‘July effect.’ Similar comparisons are made for other months, relative to May.