Table 4. Comparison of VAS score of HA injection vs. NSAID group.

VAS: visual analog scale, HMW: high molecular weight, HA: hyaluronic acid, NSAID: nonsteroidal anti-inflammatory drug, SD: standard deviation

VAS score	Single intra-articular injection of HMW HA mean ± SD	NSAID group mean ± SD	t-test value	p-value
At week 0	8.1 ± 0.6	8 ± 0.5	0.69	0.120
At week 3	6.2 ± 0.8	6.8 ± 0.7	-3.09	0.029
At week 6	4.8 ± 1.1	6 ± 1	-4.41	<0.001
At week 9	4.1 ± 1.3	5.4 ± 1.3	-3.87	<0.001
At week 12	2.8 ± 1.4	4.8 ± 1.6	-5.19	<0.001