TABLE 4.

Meta-regression for variables to predict muscle strength at different time points following total knee arthroplasty.

	Coefficient	Standard error	95% lower CI	95% upper CI	Z value	Rsquare	P value
Overall
Post-surgery time of evaluation	0.0458	0.0025	0.0409	0.0507	18.2461	0.3787	<0.001
Age of patients (years)	0.0893	0.0315	0.0276	0.1509	2.8381	0.0703	0.0045
BMI (kg/m2)	0.0986	0.0543	–0.0077	0.2050	1.8178	0.0331	0.0691
Sex ratio (males/females)	–0.4192	0.3100	–1.0268	0.1883	–1.3526	0.0182	0.1762
21–30 days post-surgery
Post-surgery time of evaluation	0.8911	1.9702	–2.9705	4.7528	0.4523	0.0035	0.6511
Age of patients (years)	0.1413	0.0582	0.0273	0.2554	2.4283	0.1693	0.0152
BMI (kg/m2)	–0.2272	0.0994	–0.4220	–0.0323	–2.2851	0.1520	0.0223
Sex ratio (males/females)	–1.5759	0.5994	–2.7507	–0.4012	–2.6293	0.2063	0.0086
45 days to 3 month post-surgery
Post-surgery time of evaluation	0.0039	0.0035	–0.0029	0.0108	1.1247	0.0382	0.2607
Age of patients (years)	0.0558	0.0293	–0.0015	0.1132	1.9086	0.1481	0.0563
BMI (kg/m2)	–0.0294	0.0391	–0.1061	0.0473	–0.7515	0,0252	0.4524
Sex ratio (males/females)	0.0388	0.2781	–0.5063	0.5839	0.1396	0.0009	0.8890
6 months post-surgery
Age of patients (years)	0.0847	0.0349	0.0162	0.1532	2.4249	0.2936	0.0153
BMI (kg/m2)	0.0409	0.0976	–0.1504	0.2323	0.4193	0.0144	0.6750
Sex ratio (males/females)	–0.6286	0.3278	–1.2711	0.0141	–1.9171	0.2006	0.0552
12 months post-surgery
Age of patients (years)	0.0957	0.0539	–0.0100	0.2015	1.7750	0.2999	0.0759
BMI (kg/m2)	0.1510	0.1274	–0.0987	0.4006	1.1853	0.1824	0.2359
Sex ratio (males/females)	–0.9445	0.4388	–1.8045	–0.0846	–2.1527	0.3939	0.0313

BMI, body mass index (kg/m²). Bold value, statistically significant predictor of muscle strength following TKA.