Table 3. Western Ontario and McMaster Universities Arthritis Index (WOMAC) and Euro-Qol 5D-5L (EQ-5D) by surgeon grade preoperative and 1 year after conventional (Conv) and navigated (Nav) TKA^*.

Conv TKA		Trainee		Senior
Scores		mean	SD	mean	SD	95% CI			p-value
EQ-5D	preop	0.58	0.21	0.54	0.22	-0.02	0.08		0.26
EQ-5D	postop	0.83	0.17	0.8	0.21	-0.02	0.09		0.25
WOMAC	preop	39.01	15.15	38.75	17.02	-4.14	4.67		0.91
WOMAC	postop	74.85	18.60	72.77	20.12	-3.21	7.36		0.44
Pain	preop	37.06	15.20	35.83	18.73	-3.44	5.91		0.60
Pain	postop	78.56	20.03	78.43	19.96	-5.31	5.55		0.97
Stiffness	preop	37.50	21.58	39.67	24.68	-8.51	4.16		0.50
Stiffness	postop	71.65	19.89	71.30	23.00	-5.53	6.22		0.91
Function	preop	39.77	16.53	39.50	17.9	-4.43	4.96		0.91
Function	postop	74.14	18.89	71.28	21.02	-2.60	8.31		0.30
Nav TKA		Trainee		Senior
Scores		mean	SD	mean	SD	95% CI			p-value
EQ-5D	preop	0.56	0.21	0.59	0.20	-0.07	0.01		0.10
EQ-5D	postop	0.80	0.20	0.82	0.18	-0.05	0.01		0.23
WOMAC	preop	38.94	16.55	40.83	15.08	-4.67	0.88		0.18
WOMAC	postop	72.71	19.52	75.77	17.78	-6.33	0.21		0.07
Pain	preop	34.92	17.87	39.43	15.88	-7.45	-1.55		0.003
Pain	postop	75.36	19.91	79.74	17.91	-7.70	-1.07		0.01
Stiffness	preop	41.28	22.76	39.65	22.85	-2.42	5.68		0.43
Stiffness	postop	69.10	21.51	71.19	20.23	-5.76	1.59		0.27
Function	preop	39.84	17.32	41.39	16.18	-4.49	1.40		0.30
Function	postop	72.36	20.13	75.14	18.61	-6.18	0.62		0.11

* For quantitative data values are given as mean and SD (standard deviation).

95% CI = 95% confidence interval of the difference. preop = preoperative. postop = postoperative