Table 7 .

Mean follow-up PROMs at second side in staged bilateral and unilateral at 6 weeks and 1 and 2 years

THR	Response at 6 weeks	Response at 1 year	Mean change in PROMs (preoperative to 6 weeks)	Mean change in PROMs (preoperative to 1 year)	MIC achieved [mean change in 1 year]	MIC not achieved [mean change in 1 year]
Unilateral	90.9% (n = 720/792)	74.2% (n = 588/792)	19.3	23.66	79.8% (n = 469/588) [25.13]	4.9% (n = 29/588) [0.93]
Second-side staged bilateral	85.1% (n = 126/148)	92.6% (n = 137/148)	18 (p = 0.296)	25.1 (p = 0.866)	96.3% (n = 131/136) [26.3] (p = 0.77)	3.6% (n = 5/136) [0.2] (p = 0.377)

MIC = minimal important change; PROM = patient-reported outcome measure