Combination of conditional cash transfer program and environmental health interventions reduces child mortality: an ecological study of Brazilian municipalities

Table 5 Results of the Fixed-effects Negative Binomial (NB) regression model to assess the interaction to the outcome of mortality due to malnutrition and diarrhea in children under 5years old

	NB regression model without zero inflation Interactions	NB regression model with zero inflation Interactions
	IRR^a (CI-90%) p-value	IRR^a (CI-90%) p-value
Malnutrition
Interaction between: PBF total Solid waste collection^#	1.0004 (1.0002–1.0005) 2.56e-09	..
Interaction between: PBF total Access to sanitation^# ≥ 20 < 50% (category 1)	..	1.0061 (0.9991–1.0132) 0.088284
Interaction between: PBF total Access to sanitation^# ≥ 50 < 100% (category 2)	..	1.0073 (1.0002–1.0145) 0.045116
Diarrhea
Interaction between: PBF total Access to water > 60% ≤85% (category 1)	0.9774658 (0.9533472–1.002195) 0.073767	0.9780299 (0.9549282–1.001691) 0.068526
Interaction between: 100% PBF target (category 2) Access to water > 85% ≤ 100% (category 2)	0.5463344 (0.285883–1.044068) 0.067326	0.558559 (0.2980557–1.046745) 0.069151
Interaction between: PBF total Access to sanitation ≥50 < 100% (category 2)	..	0.9892611 (0.9764852–1.002204) 0.103500
Interaction between: Access to water > 60% ≤ 85% (category 1) Solid waste collection	0.9837505 (0.9672618–1.00052) 0.057466	0.9892611 (0.9764852–1.002204) 0.080497
Interaction between: Access to water > 85% ≤ 100% (category 2) Solid waste collection	0.9739308 (0.9581343–0.9899877) 0.001545	0.9746869 (0.9582469–0.991409) 0.003134

Malnutrition: The model comparison references refer to sanitation: < 20% (category 0)
^#The variables: solid waste collection, sanitation and access to water were not significant in multivariate analyzes. However, solid waste collection and sanitation were significant in the interaction models, according to the values presented in this Table. In the interaction models, their individual values were for: solid waste collection (IRR 0.9815 CI 0.9750–0.9880 p-value = 2.93e-08), for sanitation category 1 (IRR 0.7611 CI 0.5316–1.0897 p-value = 0.136025) and for sanitation category 2 (IRR 0.7520 CI 0.5314–1.0640 p-value = 0.107465)
Diarrhea: The comparison references of the models refer to the target PBF: < 90% (category 0); access to water: ≤ 60% (category 0); sanitation: < 20% (category 0)
^aRatio for incidence rates ..interactions were not possible to be adjusted

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