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Table 4 IRR Results - Fixed-effects Negative Binomial (NB) regression model to assess mortality due to diarrhea in children under 5 years old

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

  NB regression model without zero inflation NB regression model with zero inflation
IRRa (CI-95%) p-value IRRa (CI-95%) p-value
Bolsa Família Program (PBF) target
  ≥ 90% ≤ 99.9% (category 1) 0.7058 (0.5427–0.9113) 0.007981 0.7363 (0.5591–0.9695) 0.029240
 100% (category 2) 0.8203 (0.6562–1.0248) 0.080057 0.9039 (0.7165–1.1404) 0.394133
 Bolsa Família Program (PBF) total 1.0220 (1.0118–1.0322) 1.71e-05 1.0218 (1.0117–1.0320) 2.20e-05
Environmental Health
 Access to water
   > 60% ≤ 85% (category 1) 0.6235 (0.4666–0.8399) 0.001897 0.6267 (0.4678–0.8396) 0.001737
   > 85% ≤ 100% (category 2) 0.5779 (0.4048–0.8221) 0.002627 0.5946 (0.4189–0.8440) 0.003624
 Access to sanitation
   ≥ 20 < 50% (category 1) 0.7927 (0.6330–0.9894) 0.040499 0.7579 (0.5912–0.9716) 0.028718
   ≥ 50 < 100% (category 2) 0.8501 (0.6317–1.1416) 0.277095 0.7152 (0.5106–1.0017) 0.051177
  Solid waste collection 0.9901 (0.9812–0.9991) 0.030414 0.9902 (0.9812–0.9993) 0.035712
Family Health Strategy (FHS) 0.9980 (0.9946–1.0014) 0.237284 0.9952 (0.9915–0.9989) 0.011344
Literacy population 15 years or older 0.9783 (0.9655–0.9914) 0.001163 0.9711 (0.9574–0.9850) 5.32e-05
Per capita income 0.7943 (0.5924–1.0666) 0.118250 0.6342 (0.4582–0.8776) 0.006007
Urbanization rate 1.0159 (1.0072–1.0248) 0.000319 1.0266 (1.0164–1.0369) 2.42e-07
Northeast Region 0.3916 (0.3021–0.5094) 2.39e-12 0.4428 (0.3367–0.5824) 5.69e-09
Midwest Region 1.0266 (0.6933–1.5124) 0.892349 3.0768 (1.7230–5.4945) 0.000145
Southeast Region 0.4497 (0.3134–0.6450) 9.49e-06 0.4999 (0.3439–0.7269) 0.000283
South Region 0.7451 (0.4937–1.1185) 0.150701 0.8881 (0.5809–1.3575) 0.583517
Year 2007 0.8551 (0.6222–1.1728) 0.331941 0.8528 (0.6228–1.1676) 0.320511
Year 2008 0.9136 (0.6650–1.2534) 0.576897 0.8999 (0.6569–1.2326) 0.511081
Year 2009 0.6731 (0.4747–0.9489) 0.024212 0.6729 (0.4768–0.9498) 0.024283
Year 2010 0.7823 (0.5401–1.1289) 0.190924 0.8082 (0.5603–1.1658) 0.254591
Year 2011 0.7859 (0.5405–1.1362) 0.197112 0.7646 (0.5280–1.1073) 0.155411
Year 2012 0.5942 (0.3984–0.8779) 0.009309 0.5859 (0.3952–0.8686) 0.007778
Year 2013 0.5577 (0.3712–0.8294) 0.004322 0.5424 (0.3628–0.8110) 0.002877
Year 2014 0.5122 (0.3356–0.7714) 0.001381 0.5077 (0.3353–0.7690) 0.001372
Year 2015 0.5507 (0.3610–0.8289) 0.004266 0.5439 (0.3588–0.8247) 0.004133
Year 2016 0.5837 (0.3862–0.8735) 0.009270 0.5719 (0.3798–0.8611) 0.007449
  1. Model without zero inflation: AIC: 5772.70. BIC: 6012.05. 2 x loglik: - 5716,685. Zero inflation model: AIC: 5746.00. BIC: 6105.05. 2 x loglik: - 5662.0
  2. The comparison references of the models refer to the target PBF: < 90% (category 0); access to water: ≤ 60% (category 0); sanitation: < 20% (category 0); regions: North region and for the year: 2006
  3. aRatio for incidence rates