Table 1.

Distribution of sample size by field, area and school

Field	Total number of first-grade students (2016/2017)*	Field sample†	Selected schools in each field (n)				Total number of students selected from schools in each area
			Boys	Girls	Coeducation schools	Total	Boys	Girls	Coeducation schools		Total
									Boys	Girls	Boys	Girls	Both
Syria	5887	334	3	1	21	25	34	9	120	171	144	180	324
Lebanon	3869	622	6	7	25	38	95	106	214	207	252	313	565
West Bank	4979	482	14	14	5	33	159	249	30	44	189	293	482
Gaza	32 780	961	14	13	40	67	204	175	295	287	499	462	961
Total	47 515	2399	37	35	91	163	492	539	659	709	1151	1248	2399

*The study population included school children in first grade during school year 2016/2017, as a reference point.

†Prevalence rate using the previously reported rate in 2005: 9.1%, 22.3%, 14.6% and 36.4% in Syria, Lebanon, West Bank and Gaza, respectively.