Table A. Comparison of mortality ratios computed for surgeries performed between the 10th and 20th of the month with those for the entire sample.

Age and sex	Femur fracture reduction		Coronary artery bypass
	Entire sample	10-20th of month	Entire sample	10-20th of month
	Mortality ratios
Total	8.80	9.19	12.58	12.38
Male	11.36	11.33	8.96	9.29
Female	7.90	8.45	27.97	25.65
65-74 years	12.32	14.43	13.17	12.14
Male	11.67	12.50	9.46	9.15
Female	12.83	16.06	30.70	27.50
75-84 years	10.45	11.20	10.33	13.04
Male	12.35	11.92	6.60	9.41
Female	9.62	10.91	22.86	23.33
85 years or over	7.45	7.35	(1)	(1)
Male	10.52	10.53	(1)	(1)
Female	6.62	6.50	(1)	(1)

¹Data on coronary artery bypass for enrollees 85 years of age or over are excluded because of the small number of procedures.