Table 3.

Cox proportional hazards models using RA as the reference group and sensitivity analyses comparing GA to RA for the matched sample.

Group	Events	Total N	Hazard Ratio	95% CI	Wald Chi-Square (D.F.)	P value
Entire Cohort	725	14,998	1.0	0.8–1.2	0.0 (1)	0.9
Subgroup Analyses
Age
66–69	54	3,766	1.1	0.8 – 1.6	0.8 (1)	0.4
70–74	129	4,460	1.0	0.8 – 1.3	0.1 (1)	0.7
75–79	220	3,634	0.9	0.7 – 1.1	1.1 (1)	0.3
80–84	199	2,122	1.0	0.6 – 1.2	0.0 (1)	0.8
85+	108	840	1.1	0.8 – 1.4	0.3 (1)	0.5
Females	395	8,716	1.0	0.9 – 1.2	0.0 (1)	0.8
Males	330	6,282	1.0	0.9 – 1.2	0.0 (1)	0.9
Index surgery
Hip replacement	184	4,178	1.1	0.9 – 1.3	0.0 (1)	0.4
Knee replacement	266	6,472	1.0	0.9 – 1.2	0.1 (1)	0.8
Inguinal hernia repair	210	2,774	0.8	0.7 – 0.9	6.6 (1)	0.01
Hysterectomy	60 – 65	1,360	1.6	1.2 – 2.3	8.2 (1)	0.004
Prostatectomy	≤5	214	1.1	0.2 – 5.3	0.0 (1)	0.9
Sensitivity Analyses
Excluding developed dementia within 90 days	680	14,956	1.0	0.9 – 1.2	0.0	1.0
Excluding death within 90 days following surgery	723	14,928	1.0	0.9 – 1.2	0.0	1.0

CI = confidence interval, D.F. = degrees of freedom, N = numbers