Table 6.

Change in the mean latent postoperative EQ-VAS Health in primary TKA (primary diagnosis osteoarthritis)

Term	Estimate (95% CI)	p value
Intercept	49.8 (44.5 to 55.2)	< 0.001
Age in years	0.00 (-0.05 to 0.05)	0.99
ASA classificationa
ASA 1	11.9 (7.5 to 16.4)	< 0.001
ASA 2	8.6 (4.5 to 12.7)	< 0.001
ASA 3	5.8 (1.7 to 9.9)	0.01
BMI class in kg/m2b
Underweight < 18.5 or normal 18.5-24.9	2.1 (0.3 to 3.9)	0.02
Preobese 25.0 to 29.9	1.8 (0.38 to 3.2)	0.01
Obese Class 1 30.0 to 34.9	0.75 (-0.6 to 2.1)	0.28
Obese Class 2 35.0 to 39.9	0.52 (-0.92 to 1.96)	0.48
Surgeon 2-year CPR	0.12 (-0.30 to 0.55)	0.58
Gender
Men	0.10 (-0.69 to 0.89)	0.81
Preoperative EQ-VAS Health	0.31 (0.29 to 0.33)	< 0.001
Variance components
Surgeon	4.3 (2.4 to 7.8)	< 0.001

The total number of patients was 6253; residual variance estimate = 230.19.

^aThe reference category for ASA is ASA 4 or 5.

^bThe reference category for BMI is obese Class 3 (≥ 40.0 kg/m²). ASA = American Society of Anesthesiologists; CPR = cumulative percent revision.