Table 3.

Distribution of sample and the response rate in the different geographical regions of Iran

Geographical region	Provinces	Universities of Medical Sciences	No. of blocks	No. of interviewers	Sample size	No. of completed interviews	Response rate
North west	Guilan	Guilan	52	8	312	276	88.5
	Ardabil	Ardabil	27	4	162	132	81.5
	Azarbaijan-e-Sharqi	Tabriz	77	11	462	419	90.7
	Zanjan	Zanjan	21	3	126	123	97.6
	Azarbaijan-e-Gharbi	Urmia	61	9	366	349	95.4
West	Kurdistan	Kurdistan	31	5	186	172	92.5
	Lorestan	Lorestan	38	6	228	219	96.1
	Ilam	Ilam	11	2	66	60	90.9
	Kermanshah	Kermanshah	41	6	246	228	92.7
	Hamadan	Hamadan	36	5	216	161	74.5
Central	Tehran	Tehran	71	10	426	1088	74.0
		Iran	80	12	480
		Shahid Beheshti	94	14	564
	Qom	Qom	23	4	138	135	97.8
	Alborz	Alborz	45	6	270	195	72.2
	Qazvin	Qazvin	25	4	150	138	92.0
South-East	Sistan-o-Baluchestan	Zahedan	45	7	270	310	95.7
		Zabol	9	2	54
	Hormozgan	Hormozgan	31	5	186	174	93.5
	Kerman	Kerman	40	6	240	323	96.1
		Jiroft	10	2	60
		Rafsanjan	6	1	60
South-West	Isfahan	Isfahan	90	13	540	582	98.0
		Kashan	9	1	54
	Markazi	Arak	22	3	132	121	92.0
	Chaharmahal-va-Bakhtiari	Shahrekord	19	3	114	114	100
	Khuzestan	Ahvaz Jundishapur	82	12	492	494	89.5
		Dezful	10	1	60
North	Semnan	Semnan	8	1	48	69	88.5
		Shahroud	5	1	30
	Mazandaran	Mazandaran	53	8	318	337	89.2
		Babol	10	2	60
	Golestan	Golestan	35	5	210	178	84.8
North-east	Khorasan-e-Razavi	Mashad	93	13	558	623	85.8
		Torbat Heydariyeh	6	1	36
		Gonabad	2	1	12
		Sabzevar	10	1	60
		Nishapur	10	2	60
	Khorasan-e-Jonubi	Birjand	13	2	78	78	100
	Khorasan-e-Shomali	North Khorasan	17	3	102	91	89.2
South	Fars	Shiraz	85	12	510	534	95.7
		Fasa	4	1	24
		Jahrom	4	1	24
	Bushehr	Bushehr	20	3	120	113	94.2
	Kohgiluyeh-va-Boyer-Ahmad	Yasuj	14	2	84	80	95.2
	Yazd	Shahid Sadoughi	22	3	132	121	91.7