Table 1.

Characteristics of study population

	Rural area of Hanoi		Urban area of Hanoi
	Dong Son Non-flooded	Nam P. Tien Flooded	Thanh Tri Non-flooded	Thinh Liet Flooded
Number of households	n=194	n=205	n=250	n=222
Average number of persons/household	4.55	4.91	4.23	4.34
Gender of respondents	n=194	n=205	n=250	n=222
Male	57.1	61.0	49.2	53.6
Female	42.9	39.0	50.8	46.4
Religion	n=883	n=1,007	n=1,057	n=963
Catholic	12.7	0.1	0.1	0.9
Protestant	0	0.1	0	0
Buddhist	4.5	3.1	0.9	0.7
Ancestor	79.0	96.7	95.9	93.5
Other	3.7	0	3.1	4.9
Income/person/month 1 US$=17,813 VND	587,650=33 $	462,130=26 $	1,111,160=63$	1,096,710=62$
Marital status	n=883	n=1,007	n=1,057	n=963
Married	49.7	50.4	57.3	56.1
Unmarried	45.6	43.6	38.0	38.7
Separated	0.2	0.1	0.2	0
Divorced	0.2	0.2	0.2	0.5
Widowed	4.2	5.7	4.3	4.7