Subsequent total joint arthroplasty: Are we learning from the first stage?

Table 1 Demographic data for arthroplasty patients based on procedure number

	First procedure	Second procedure	P value
Arthroplasty (n = 1286)
Age (yr)	65.0 (58.0, 71.0)	66.0 (58.0, 72.0)	0.185
BMI (kg/m2)	30.5 (26.6, 34.9)	30.4 (26.5, 35.1)	0.920
Female sex	362 (56.4)	362 (56.4)	1.000
ASA 1 or 2	373 (58.1)	370 (57.6)	0.865
Total knee arthroplasty (n = 728)
Age (yr)	66.0 (61.0, 72.0)	67.0 (62.0, 73.0)	0.218
BMI (kg/m2)	31.3 (27.4, 35.7)	31.5 (27.5, 36.0)	0.878
Female sex	210 (57.7)	210 (57.7)	1.000
ASA 1 or 2	193 (53.0)	192 (52.7)	0.941
Total hip arthroplasty (n = 556)
Age (yr)	62.0 (54.0, 69.0)	62.0 (54.0, 70.0)	0.468
BMI (kg/m2)	28.9 (25.5, 33.4)	29.2 (25.7, 33.0)	0.734
Female sex	152 (54.7)	152 (54.7)	1.000
ASA 1 or 2	180 (64.7)	178 (64.0)	0.859

Continuous data are presented as median (lower quartile, upper quartile). Categorical data are presented as count (percent). BMI: Body mass index; ASA: American Society of Anesthesiologists.