Table 3.

The 15D scores collected before the operation, 6 and 12 months post-operatively.

	15D
	Baseline level	6-month F-U	p value	12-month F-U	p value	Control population
THA
n	802	574		569
Mean 15D (SD, 95% CI)	0.824	0.888		0.886		0.901
Change of the mean 15D (SD, 95% CI)		0.064 (0.076, 0.058–0.070)	<0.001	0.062 (0.083, 0.055–0.069)	<0.001
TKA
n	1017	750		731
Mean 15D (SD, 95% CI)	0.837	0.869		0.870		0.896
Change of the mean 15D (SD, 95% CI)		0.032 (0.074, 0.026–0.037)	<0.001	0.033 (0.076, 0.028–0.039)	<0.001

F-U: follow-up; THA: total hip arthroplasty; SD: standard deviation; CI: confidence interval; TKA: total knee arthroplasty.