Table 1. Baseline characteristics of participants.

	PRP group							Placebo group
	n	%			Mean±SD	Min-Max	Min-Max	n	%	Mean±SD		Min-Max	Min-Max	p
Age (year)					59.3±6.9	59.5	44-68			56.5±7.4		55	47-70	0.302†
Sex														NA
Male	14							15
Female	16							15
KL-Grade														0.694‡
2	14	38.9						6	25.0
3	22	61.1						18	75.0
Height (cm)					164.85±8.27	165	152-180			165.42±9.60		167	145-180	0.528†
Weight (kg)					78.00±10.81	75	67-100			79.50±14.32		81	54-102	0.680†
PRP: Platelet-rich plasma; SD: Standard deviation; KL: Kellgren-Lawrance; † Mann Whitney U test; ‡ Fisher exact test; NA: Not applicable.