Table 3. Preoperative symptom predictors of non-response 12 months after TKA.

	Wald	OR	95% CI		P-value
Demographic variables
Age (years)	1.5	1.0	1.0	1.1	.23
Male sex (female as reference)	0.4	1.3	0.3	1.8	.52
Symptoms*
Pain	4.4	1.8	1.04	3.1	.04
Lack of energy	2.0	1.5	0.9	2.7	.15
Feeling drowsy	2.5	1.5	0.92	2.4	.11
Difficulty sleeping	2.9	0.7	0.5	1.1	.09
Feeling bloated	3.5	0.7	0.5	1.0	.06
Worrying	2.1	1.4	0.9	2.1	.15
Problems with sexual interest or activity	4.0	1.4	1.01	1.8	.04

Model fit parameters: Omnibus test: p<0.001. Hosmer and Lemeshow test: Chi-square = 8.97, df = 8, p = 0.35.

Cox & Snell R-square: 15.5%, Nagelkerke R-square: 23.5%. -2 Log likelihood: 165.9.

P < .05 is considered statistically significant.

Dependent variable: Responders (coded 0) and non-responders (coded 1) after TKA.

Abbreviations: CI = Confidence Interval. OR = Odds Ratio

*7 most distressful symptoms from the Memorial Symptom Assessment Scale—Short Form