Table 3

Within operation comparisons

		Change in mean score	95% CI
OXS
Preoperation—12 months	Hip	−20.2	(−20.9 to −19.5)
Preoperation—12 months	Knee	−15.4	(−16.2 to −14.7)
Preoperation—6 months	Hip	−19.2	(−19.9 to −18.5)
Preoperation—6 months	Knee	−13.9	(−14.6 to −13.1)
6 months—12 months	Hip	−1.0	(−1.7 to −0.3)
6 months—12 months	Knee	−1.5	(−2.3 to −0.8)
PCS
Preoperation—12 months	Hip	13.2	(12.4 to 14.0)
Preoperation—12 months	Knee	10.2	(9.4 to 11.0)
Preoperation—6 months	Hip	12.3	(11.6 to 13.1)
Preoperation—6 months	Knee	9.4	(8.6 to 10.2)
6 months—12 months	Hip	0.9	(0.1 to 1.6)
6 months—12 months	Knee	0.8	(−0.02 to 1.6) ns
MCS
Preoperation—12 months	Hip	3.1	(2.1 to 4.1)
Preoperation—12 months	Knee	0.3	(−0.8 to 1.3) ns
Preoperation—6 months	Hip	3.9	(2.9 to 4.9)
Preoperation—6 months	Knee	0.6	(−0.6 to 1.5) ns
6 months—12 months	Hip	−0.8	(−1.8 to 0.2) ns
6 months—12 months	Knee	−0.2	(−1.2 to 1.5) ns

MCS, mental component summary; ns, not significant; OXS, Oxford Score; PCS, physical component summary.