TABLE 1.

Patient- and Procedure-Related Characteristics, Subgrouped by Type of Anesthesia

Patient-Related Demographics
	Neuraxial		Neuraxial/General		General		P
n	3066	4259	22,699
%	11.10%	15.30%	73.60%
Comorbidity burden
Average Deyo Index (SE)	0.97 (0.92–1.01)	0.99 (0.96–1.03)	1.00 (0.98–1.01)	0.3896
	n	%	n	%	n	%	P
Deyo Index category
0	1445	47.5	1964	47.4	10,586	46.5	0.2447
1	661	21.2	858	20.1	4552	20.1
2	620	20.5	915	20.7	4935	22.0
≥3	340	10.8	522	11.9	2626	11.4
Age
Average age (CI), y	64.2 (63.9–4.6)	63.9 (63.6–64.2)	63.0 (62.9–63.2)	<0.0001
	n	%	n	%	n	%	P
Age category, y
<45	54	1.9	92	2.1	570	2.5	<0.0001
45–54	423	14.3	585	14.2	3723	16.5
55–64	1085	34.5	1525	35.5	8335	36.7
65–74	1050	34.9	1443	33.4	7249	31.6
>75	454	14.3	614	14.8	2822	12.6
Sex
Female	1404	46.2	1994	46.6	10475	45.8	0.6683
Male	1662	53.8	2265	53.4	12224	54.2
Ethnicity
White	2435	82.4	3602	84.2	17893	76.8	<0.0001
African  American	144	4.8	289	6.0	1966	7.9
Hispanic	38	1.0	51	1.3	409	2.1
Other	449	11.7	317	8.5	2431	13.2
Procedure type
Total hip arthroplasty	672	21.3	1043	24.0	5788	24.8	0.0005
Total knee arthroplasty	2394	78.7	3216	76.0	16911	75.2
Admission type
Emergent	13	0.5	135	4.2	680	3.8	<0.0001
Urgent	112	3.8	238	3.9	929	3.9
Elective	2937	95.6	3882	91.8	21,037	92.0
Other	4	0.1	4	0.1	53	0.3

The P value indicates testing of the null hypothesis (= no difference across all 3 groups: neuraxial, neuraxial/general, and general): 1-way analysis of variance, Kruskal-Wallis test (for continuous outcomes), χ² test (for categorical outcomes).