Table 2.

Frequency counts for selected variables stratified by age and surgical procedure.

	Age Group
	Hip Procedures					Knee Procedures
Exposure	65-69 years of age	70-74 years of age	75-79 years of age	≥80 years of age	total	65-69 years of age	70-74 years of age	75-79 years of age	≥80 years of age	total
CVD alone	87	129	160	194	570	241	342	382	391	1356
CAD alone	1677	2269	2503	2683	9132	4065	5413	5608	4931	20017
CHF alone	143	209	277	468	1097	441	574	702	1029	2746
Diabetes alone	2159	2229	1935	1459	7782	8975	8197	6116	3452	26740
COPD alone	2110	2220	1949	1710	7989	4978	4873	4065	2920	16836
CAD and CHF alone	87	124	190	330	731	249	335	449	645	1678
CAD and COPD alone	359	443	485	444	1731	726	937	978	725	3366
CAD and Diabetes alone	512	673	632	503	2320	1909	2216	1906	1124	7155
COPD and Diabetes alone	341	356	298	186	1181	1359	1148	772	409	3688
All other 2+ combinations	482	673	763	807	2725	1593	1904	1896	1485	6878
None of the above comorbidities	15448	15563	14124	12678	57813	38827	37669	31704	24940	133140

Abbreviations: CAD = coronary artery disease, CHF = congestive heart failure, COPD = chronic obstructive pulmonary disease, CVD = cerebrovascular disease.