Table 2. Change Scores for PROM^a.

PROM	Mean (SD) [range]	Median (IQR) [1st quartile to 3rd quartile]
HOOS
Total	236.0 (53.8) [−121.0 to 490.0]	256.7 (139.2) [168.2 to 307.4]
Pain	47.6 (20.5) [−20.0 to 100.0]	47.5 (22.5) [37.5 to 60.0]
Symptoms	45.1 (21.5) [−20.0 to 95.0]	45.0 (30.0) [30.0 to 60.0]
Activities of daily living	43.7 (22.1) [−32.3 to 100.0]	46.5 (27.8) [30.8 to 58.6]
Recreation	49.2 (33.5) [−68.8 to 100.0]	56.3 (50.0) [25.0 to 75.0]
Quality of life	50.3 (27.8) [−31.3 to 100.0]	50.0 (37.5) [31.3 to 68.8]
JR	39.7 (20.2) [−19.1 to 100.0]	40.6 (26.4) [27.0 to 53.4]
KOOS
Total	172.2 (96.9) [−146.8 to 369.9]	173.3 (125.3) [111.5 to 236.8]
Pain	38.0 (20.4) [−38.9 to 88.9]	38.9 (25.0) [25.0 to 50.0]
Symptoms	29.5 (22.1) [−46.4 to 92.9]	28.6 (28.6) [14.3 to 42.9]
Activities of daily living	34.8 (20.5) [−39 to 100.0]	35.3 (26.5) [22.1 to 48.6]
Recreation	34.6 (31.1) [−75 to 100.0]	31.3 (47.1) [12.9 to 60.0]
Quality of life	35.2 (26.8) [−37.5 to 93.8]	37.5 (37.5) [18.7 to 56.2]
JR	30.4 (17.5) [−28.4 to 91.7]	29.3 (21.4) [19.8 to 41.2]

Abbreviations: HOOS, Hip Disability and Osteoarthritis Outcome Score; IQR, interquartile range; JR, joint replacement; KOOS, Knee Injury and Osteoarthritis Outcome Score; PROM, patient-reported outcome measure.

^aThe change score is defined as the postoperative score minus the preoperative score.