Table 1.

The selection of sampling area based on the level of vulnerability against earthquake and the index of urban development and social welfare in each region of Tehran.

Vulnerability level	Urban development of the districts	Selected block Number	Number of samples from each block	Necessary number of samples	Total filled questionnaires
Low vulnerability area	11	103	40	76	80
	20	142	40
Medium Vulnerability area	1	9, 11	40	158	160
	7	63, 83	40
	10	104, 105	40
	15	114	40
High vulnerability area	2	67, 68	43	126	129
	5	47, 69	43
	8	60, 61	43
Total number of samples				360	369