Table 7.

Comparison of studies presenting anchor-based change scores for HOOS JR and KOOS JR

Study	Change score	Attributed category	Mean follow-up	Anchor item and response	Anchor instrument
HOOS JR
Hung et al. [15]	18	MCID	3 to 6 months	Compared to your FIRST EVALUATION at the University Orthopaedic Center: How would you describe your physical function now?”	UOC satisfaction surveya
				2- or 3-point change
Lyman et al. [29]	18	MCID	2 years	“How much did your surgery improve your quality of life?”	HSS satisfaction surveyb
				Moderate improvement
Lyman et al. [29]	22	SCB	2 years	“How much did your surgery improve your quality of life?”	HSS satisfaction surveyb
				Great improvement OR more improvement than I dreamed possible
Kuo et al. [23]	18	MCID	1 year	SAPS items: (1) satisfaction with results of surgery, (2) satisfaction with results of surgery for improving pain, (3) satisfaction with results of surgery for improving ability to do home or yard work, and (4) satisfaction with results of surgery for improving ability to do recreational activities	SAPSc
				All SAPS items > 50 (4-point Likert scale)
Guenthner et al. [14]	35	MCID		“In general, would you say your quality of life is:” (5-point Likert scale)	PROMIS-10 QOLd
				1- or 2-point increase
Current study	23	MCID	1 year	“Do you consider that your current state is satisfactory?”	PASS
				Yes
KOOS JR
Hung et al. [15]	15	MCID	3-6 months	Compared to your FIRST EVALUATION at the University Orthopaedic Center: How would you describe your physical function now?”	UOC satisfaction surveya
				2- or 3-point change
Lyman et al. [29]	14	MCID	2 years	“How much did your surgery improve your quality of life?”	HSS satisfaction surveyb
				Moderate improvement
Lyman et al. [29]	20	SCB	2 years	“How much did your surgery improve your quality of life?”	HSS satisfaction surveyb
				Great improvement OR more improvement than I dreamed possible
Kuo et al. [23]	21	MCID	1 year	SAPS items: (1) satisfaction with results of surgery, (2) satisfaction with results of surgery for improving pain, (3) satisfaction with results of surgery for improving ability to do home or yard work, and (4) satisfaction with results of surgery for improving ability to do recreational activities	SAPSc
				All SAPS items > 50 (4-point Likert scale)c
Only et al. [35]	29	MCID	1 year	“In general, would you say your quality of life is:” (5-point Likert scale)	PROMIS-10 QOLd
				1- or 2-point increase
Current study	16	MCID	1 year	“Do you consider that your current state is satisfactory?”	PASS
				Yes

^aFor the UOC (University Orthopaedic Center) satisfaction survey, no change equates to a 0 value; the negative ratings are from -3 to -1 and positive ratings are from 1 to 3.

^bIn this QOL survey, answers include “more improvement than I ever dreamed possible,” “great improvement,” “moderate improvement,” “a little improvement,” or “no improvement.”

^cThe SAPS (Self-administered patient satisfaction scale) instrument is scored on a 4-point Likert scale, with responses consisting of very satisfied (100 points), somewhat satisfied (75 points), somewhat dissatisfied (50 points), and very dissatisfied (25 points). The SAPS total score is the unweighted mean of the individual items, ranging from 25 to 100.

^dThe PROMIS-10 (Patient-Reported Outcome Measurement Information System) QOL (quality of life) anchor questions are rated on a 5-point Likert scale (poor, fair, good, very good, or excellent), where the difference between increasing responses is 1 point. MCID = minimum clinically important difference; SCB = substantial clinical benefit; HSS = Hospital for Special Surgery.