The Effect of Platelet-Rich Plasma on Pain, Function, and Quality of Life of Patients with Knee Osteoarthritis

Table 1

Demographic data.

Variables	Group characteristics	Number (percent)
Educational level	Below high-grade; school diploma	27 (45%)
	High-grade school; diploma and higher	33 (55%)
Dominant knee involvement	Right	23 (38.3%)
	Left	37 (61.7%)
Grade of tibiofemoral osteoarthritis	Grade 1	3 (5%)
	Grade 2	25 (41.7%)
	Grade 3	22 (36.7%)
	Grade 4	10 (16.7%)
Grade of patellofemoral osteoarthritis	Grade 1	6 (10%)
	Grade 2	21 (35%)
	Grade 3	19 (31.7%)
	Grade 4	12 (20%)
Regular physical activity; (3 times a week, for at least; 30 minutes every time)	Regularly active; Not active	31 (51.7%); 29 (48.3%)
Symptom period	3–12 months; More than 12 months	9 (15%); 51 (85%)