Table 1.

Participants' socio-demographic characteristics

Variable	Boys	Girls	p	All	Range
	(n=273)	(n=298)		(n=571)
Age (yrs)	14.29± 2.37	14.18 ±2.16	0.022	14.23± 2.27	10–19
Height (m)	1.55± 0.12	1.54 ±0.09	0.000	1.55± 0.10	1.27–1.83
Weight (kg)	44.13± 11.01	45.18± 9.92	0.027	44.68 ±10.46	24–79
BMI (kg/m2)	18.07± 2.61	18.75± 2.90	0.068	18.43 ±2.79	11.71–28.16
Age at first pain experience (yrs)	11.56±	2.61	12.13± 2.07	11.86± 2.36	5–18
Duration of last episode			< One day - 54.5% < One week - 31.2% < One month - 7.9% < Three months- 3.0% > Three months – 3.3%