Table 3.

Overall Spearman correlation coefficients

	TKR			THR
	2-yr KOOS Pain Spearman ρ (95% CI)	2-yr KOOS Function Spearman ρ (95% CI)	2-yr KOOS QOL Spearman ρ (95% CI)	2-yr HOOS Pain Spearman ρ (95% CI)	2-yr HOOS Function Spearman ρ (95% CI)	2-yr HOOS QOL Spearman ρ (95% CI)
Baseline EQ-5D score	0.24 (0.21, 0.27)	0.27 (0.25, 0.30)	0.23 (0.19, 0.26)	0.20 (0.17, 0.23)	0.23 (0.20, 0.25)	0.19 (0.16, 0.23)
2-year EQ-5D score	0.53 (0.51, 0.56)	0.59 (0.56, 0.61)	0.46 (0.42, 0.49)	0.52 (0.50, 0.55)	0.57 (0.54, 0.59)	0.50 (0.47, 0.52)
Baseline MCS	0.19 (0.17, 0.22)	0.24 (0.21, 0.27)	0.21 (0.17, 0.25)	0.22 (0.19, 0.25)	0.25 (0.22, 0.28)	0.21 (0.17, 0.24)
2-year MCS	0.25 (0.22, 0.28)	0.31 (0.29, 0.34)	0.24 (0.20, 0.27)	0.27 (0.25, 0.30)	0.29 (0.27, 0.32)	0.27 (0.24, 0.31)
Baseline PCS	0.18 (0.16, 0.21)	0.24 (0.22, 0.27)	0.19 (0.15, 0.23)	0.16 (0.13, 0.18)	0.21 (0.19, 0.24)	0.20 (0.17, 0.24)
2-year PCS	0.54 (0.52, 0.56)	0.63 (0.61, 0.65)	0.54 (0.51, 0.57)	0.52 (0.50, 0.54)	0.62 (0.60, 0.64)	0.58 (0.55, 0.60)

Spearman correlation coefficients were calculated to evaluate the correlation between 2 year HOOS/KOOS pain, function and QOL with baseline and 2-year EQ-5D,SF-12 MCS, SF-12 PCS. Correlation estimates were converted to Fisher’s Z to ascertain 95% confidence intervals for the corresponding estimate.