Table 7.

Factors Associated with a High Global VAS Assessment Scores at 6- and 12-Month Follow-up.^a

	Coefficient (95% CI)	P
At 6 months
Baseline global VAS pain score (mm)	0.5 (0.3, 0.6)	<0.001
Kellgren-Lawrence grade 3	7.5 (1.8, 13.0)	0.010
Arthrocentesis	−14.7 (–26.2, –3.2)	0.012
At 12 months
Baseline global VAS pain score (mm)	0.4 (0.3, 0.6)	<0.001
Kellgren-Lawrence grade 3	10.0 (3.7, 16.6)	0.002
Age	−0.3 (–0.6, –0.01)	0.026
OA in contralateral knee	−7.5 (–14.1, –0.9)	0.026

CI = confidence interval; OA = osteoarthritis; VAS = visual analog scale.

^a Variables entered into the models were treatment received, sex, Kellgren-Lawrence grade, age, body mass index (BMI), smoking status, alcohol consumption, OA in contralateral knee, history of physical therapy, history of steroid injection, history of other injection, history of arthrocentesis, history of nonsteroidal anti-inflammatory drug (NSAID) treatment, and baseline global VAS assessment score.