. Author manuscript; available in PMC: 2013 Oct 1.

Published in final edited form as: J Arthroplasty. 2012 May 2;27(9):1696–1700. doi: 10.1016/j.arth.2012.03.005

Table 2.

Comparison of anesthesia time, operative time, tourniquet time and length of hospital stay between groups

	Group 1^a (n=39) Mean ± SD (min, max)	Group 2^a (n=25) Mean ± SD (min, max)	Group 3^a (n=61) Mean ± SD (min, max)	Group 1 vs. Group 2^b	Group 1 vs. Group 3^b	Group 2 vs. Group 3^b
Anesthesia time (minutes)	231 ± 60 (131, 413)	243 ± 92 (150, 455)	203 ± 51 (94, 351)	0.58	0.017	0.049
Operative time (minutes)	183 ± 57 (100, 360)	191 ± 92 (79, 404)	144 ± 48 (65, 302)	0.70	<0.001	0.022
Tourniquet time (minutes)	77 ± 46 (0, 181)	90 ± 46 (0, 160)	58 ± 38 (0, 136)	0.26	0.031	0.003
Duration of stay (days)	6.1 ± 2.3 (3, 14)	5.7 ± 1.9 (4, 11)	6.0 ± 3.0 (4, 17)	0.41	0.74	0.62

Group 1 underwent TKA prior to bariatric surgery for weight loss; Group 2 underwent TKA less than or equal to 2 years after bariatric surgery; Group 3 underwent TKA greater than 2 years after bariatric surgery

Significance by overall analysis of variance (ANOVA) was as follows: anesthesia time (p=0.014), operative time (p=0.001) Tourniquet time (p=0.003) and length of stay (p=0.80); in the table we show the comparisons of each group to each other using two sample t-test, assuming unequal variances.