Does ethnicity and education influence preoperative disability and expectations in patients undergoing total knee arthroplasty?

Table 1 Characteristics of the total patient population n (%)

	All patients
Baseline characteristics
BMI (mean ± SD)	29.7 ± 5
Age (mean ± SD)	66.8 ± 10
Gender
Male	308 (36.6)
Female	534 (63.4)
Smoking
Non-smoker	492 (58.6)
Former smoker	213 (25.4)
Active smoker	134 (16)
Duration of education
More than 12 yr	255 (30.8)
9-12 yr	371 (44.8)
0-9 yr	203 (24.5)
Ethnicity
Born in Denmark	764 (92.2)
Born outside Denmark	65 (7.8)
Preoperative level of function and symptoms
Walking aid outside the home:
None	597 (71.2)
One cane	133 (15.9)
Two canes	34 (4.1)
Wheeled walker	69 (8.2)
Do not leave the home	6 (0.7)
Oxford knee score (mean ± SD)	23.6 ± 8
Knee pain during activity1, median (range)	63 (0:100)
Quality of life1, median (range)	47 (0:100)
Level of symptoms1, median (range)	50 (0:100)
Preoperative expectations
Knee pain 1 yr after surgery1, median (range)	2 (0:100)
Quality of life 1 yr post-OP1, median (range)	94 (0:100)
Level of symptoms. 1 yr post-OP1, median (range)	3 (0:99)

¹Visual analogue scale 0-100. BMI: Body mass index.