Table 1.

Baseline patients’ characteristics of responders and non-responders to the 12-month follow-up questionnaire

	Responders (N = 892)	Non-responders (N = 789)	p value
Age in years: mean (SD)	68.74 (9.92)	69.07 (9.65)	0.505
Joint: hip: n (%)	365 (40.92%)	289 (36.26%)	0.051
Gender: female: n (%)	529 (59.37%)	507 (63.77%)	0.71
BMI: mean (SD)	29.37 (4.61)	29.98 (4.71)	0.012
WOMAC: mean (SD)
Pain	55.26 (18.17)	58.60 (19.54)	<0.001
Stiffness	56.92 (24.24)	60.70 (24.46)	0.002
Function	62.53 (17.28)	66.65 (17.28)	<0.001
SF-12: mean (SD)
PCS	29.80 (7.08)	29.69 (7.46)	0.787
MCS	43.34 (14.23)	41.21 (14.40)	0.006
Higher education: n (%)
Secondary education/University	176 (20.39%)	121 (15.71%)	<0.001
Primary education	511 (59.21%)	419 (54.42%)
None	176 (20.39%)	230 (29.87%)
Previous intervention: n (%)
Yes	311 (36.4%)	287 (37.18%)	0.758
No	543 (63.6%)	485 (62.82%)
Expectation items
Pain relief: n (%)
Low	89 (10.31%)	135 (17.26%)	<0.001
High	287 (33.26%)	282 (36.06%)
Very high	487 (56.43%)	365 (46.68%)
Daily activities: n (%)
Low	165 (18.94%)	215 (27.53%)	<0.001
High	407 (46.73%)	326 (41.74% )
Very high	299 (34.33%)	240 (30.73%)
Ability to walk: n (%)
Low	82 (9.40%)	130 (16.71%)	<0.001
High	352 (40.37%)	329 (42.29%)
Very high	438 (50.23%)	319 (41.00%)
To interact with others: n (%)
Low	221 (26.06%)	257 (33.68%)	0.002
High	330 (38.92%)	330 (38.92%)
Very high	297 (35.02%)	221 (28.96%)
Psychological well-being: n (%)
Low	171 (20.38%)	200 (26.49%)	0.015
High	355 (42.31%)	290 (38.41%)
Very high	313 (37.31%)	265 (35.10%)

Score direction: WOMAC, higher scores indicating worse HRQoL; SF-12, higher scores indicating better HRQoL.

SD, Standard deviation; BMI, Body Mass Index; WOMAC, Western Ontario and McMaster Universities Osteoarthritis Index; SF-12, Short Form 12; PCS, physical component summary of the SF-12; MCS, mental component summary of the SF-12.