Table 2. The most parsimonious model of the worm burden of Ascaris lumbricoides ignoring random effects.

	DF†	Change in deviance‡	Residual DF†	Residual deviance	p-value
Null	NA	NA	4,038	5,704	NA
Age group	10	181.3	4,028	5,522	< 0.001
Population	2	132.0	4,026	5,390	< 0.001
Sex	1	28.8	4,025	5,361	< 0.001
Ethnicity of household	2	236.4	4,023	5,125	< 0.001
Rent paid per household	1	38.0	4,022	5,087	< 0.001
No. sleepers per household	2	12.3	4,020	5,075	0.002
No. children per household	3	19.4	4,017	5,055	< 0.001
Rooms per household	1	15.5	4,016	5,040	< 0.001
Floor construction of house	1	74.6	4,015	4,965	< 0.001
Household source of water for washing plates	3	18.6	4,012	4,947	< 0.001
Household latrine facility	2	22.8	4,010	4,924	< 0.001
Age group × Population	20	126.3	3,990	4,798	< 0.001
Age group × Sex	10	27.2	3,980	4,770	0.002
Ethnicity of household × Rent paid per household	2	20.1	3,978	4,750	< 0.001

†: Degrees of freedom.

‡: Deviance is the difference between a fitted model's log-likelihood and the maximum achievable log-likelihood.