The Survey of Knee Osteoarthritis in the Population over Age 50 Visited in the Health Bus in Kermanshah, Iran

Table 3

The prevalence rate of knee pain when doing various activities.

The amount of pain	Standing upright	Sitting or lying	At night when in bed	Up and down the stairs	Walking on a flat surface	Bending the knee	Knee extension	Rotate on the knee
None	371	383	366	260	375	430	421	48
	63.0%	65.0%	62.1%	44.1%	63.2%	73.0%	71.5%	71.0%
Mild	108	101	78	120	97	83	94	91
	18.3%	17.1%	13.2%	20.4%	16.5%	14.1%	16.0%	15.4%
Moderate	58	62	63	97	75	46	42	40
	9.8%	10.5%	10.7%	16.5%	12.7%	7.8%	7.1%	6.8%
Severe	46	37	76	104	39	26	27	36
	7.8%	6.3%	12.9%	17.7%	6.6%	4.4%	4.6%	6.1%
Extreme	6	6	6	8	5	4	5	4
	1.0%	1.0%	1.0%	1.4%	0.8%	0.7%	0.8%	0.7%