Table 2.

Number (%) of patients achieving MCII at 3, 6 and 9 months

Visit	Control	Spa therapy	p Value
3 Months	70/179 (39.1%)	107/183 (58.5%)
6 Months	68/187 (36.4%)	99/195 (50.8%)	0.005
Details
Improvement of VAS pain*	36/186 (19.4%)	63/193 (32.6%)
Improvement of WOMAC function†	49/172 (28.5%)	75/179 (41.9%)
9 Months	62/173 (35.8%)	93/173 (53.8%)

MCII is defined as ≥19.9 mm on the VAS pain scale and/or ≥9.1 points on the WOMAC function subscale normalised to a 0–100 score and no knee surgery.

^*Three missing values for VAS pain.

^†31 Missing values for WOMAC function.

MCII, minimal clinically important improvement; VAS, visual analogue scale; WOMAC, Western Ontario and McMaster Universities osteoarthritis index.