Table 5 The amount of satisfaction among the four groups

From: The comparison effects of intra-articular injection of Platelet Rich Plasma (PRP), Plasma Rich in Growth Factor (PRGF), Hyaluronic Acid (HA), and ozone in knee osteoarthritis; a one year randomized clinical trial

  PRP PRGF HA Ozone P Test
Very little 4 (7.7%) 5 (9.8%) 7 (14.3%) 8 (16.7%) 0.06 Kruskal-Wallis
Little 9 (17.3%) 8 (15.7%) 8 (16.3%) 7 (14.6%)  
Moderate 10 (19.2%) 9 (17.6%) 12 (24.5%) 19 (39.6%)
Much 15 (28.8%) 17 (33.3%) 13 (25.6%) 9 (18.8%)
Very much 14 (26.9%) 12 (23.5%) 9 (18.4%) 5 (10.4%)