Table 1.
Demographic characteristics of study subjects
| Group 1a (n=39) Mean ± SD (min, max) |
Group 2a (n=25) Mean ± SD (min, max) |
Group 3a (n=61) Mean ± SD (min, max) |
Group 1 vs. Group 2b |
Group 1 vs. Group 3b |
Group 2 vs. Group 3b |
|
|---|---|---|---|---|---|---|
| Age (years) | 55.5 ± 6.5 (41, 71) | 59.3 ± 7.5 (43, 71) | 59.0 ± 8.4 (46, 79) | 0.042 | 0.021 | 0.87 |
| BMI (kg/m2) | 43.1 ± 6.3 (32.4, 58) | 37.9 ± 7.5 (23.9, 58.8) | 38.5 ± 9.8 (24.2, 90.5) | 0.007 | 0.005 | 0.78 |
| Weight (kg) | 121.5 ± 19.3 (86, 155) | 104.1 ± 19.3 (69, 131) | 101.4 ± 22.6 (62, 165) | 0.001 | <0.001 | 0.57 |
| Height (cm) | 167.8 ± 10.4 (151, 197) | 166.0 ± 8.5 (144, 177) | 162.7 ± 8.5 (135, 184) | 0.45 | 0.012 | 0.11 |
| Sex (F/M) c | 28/11 | 22/3 | 49/12 | n/a | n/a | n/a |
a
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
b
Significance by overall analysis of variance (ANOVA) was as follows: age (p=0.055), BMI (p=0.015), weight (p<0.001) and height (p=0.021); in the table we show the comparisons of each group to each other using two-sample t-test, assuming unequal variances.
c
There was no significant difference in gender distribution by group, p=0.28 (Chi-square) SD, standard deviation; n/a, not applicable; F/M, female/male