Table 3.

Multivariable risk factors analysis for adult diarrhoeal disease in 232 cases and 232 controls in Hanam province, Vietnam, 2009-2010

Determinants		OR *	95% CI	AF**	% exposure among controls
Agricultural activities
	Yes versus No	1.1	0.6-2.0	0.04	75
Source of drink water (versus tap water)
	Rainwater	5.4	2.4-12.1	0.77	78
	Tube well water	2.2	0.4-12.4	0.03	3
Contact with person with diarrhoea
	Yes versus No	3.7	1.4-10.3	0.08	3
Composting of human excreta in the household
	≤ 3 months versus > 3 months	2.4	1.4-4.3	0.51	72
Handling human excreta in field work
	Yes versus No	5.4	1.4-21.1	0.07	2
Use of animal excreta as fertiliser in the fields
	Yes versus No	1.6	1.0-2.6	0.16	32
Handling animal excreta in field work
	Yes versus No	3.3	1.8-6.0	0.36	25
Use of Nhue River water to irrigate fields
	Yes versus No	1.0	0.4-2.5	0.00	90
Direct contact with Nhue River water during field work
	Yes versus No	2.4	1.2-4.7	0.27	26
Close contact with local pond water
	Yes versus No	2.3	1.2-4.3	0.14	13
No use of protective measures at work
	Yes versus No	6.9	3.5-13.9	0.78	61
Eating raw vegetables the day before
	Yes versus No	2.4	1.2-4.6	0.12	10
Eating leftover foods from day before
	Yes versus No	1.1	0.7-1.8	0.06	45
Handwashing with soap in general (versus frequently)
	Sometime	2.5	1.3-4.9	0.27	25
	Never or rarely	3.3	1.8-6.3	0.51	45

OR*: matched odds ratio derived from multivariable conditional logistic regression analysis and adjusted for age groups and sex.

CI: confidence interval.

AF **: attributable fraction in the population.