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Table 4 Differences-in-differences analysis using negative binomial regression on malaria cases

From: Mass testing and treatment for malaria followed by weekly fever screening, testing and treatment in Northern Senegal: feasibility, cost and impact

Covariates Incidence risk ratio (95% CI) p value
Time effects
 Pre-intervention 1.0 (Ref.)
 Post-intervention 0.87 (0.69–1.09) 0.232
Group effects
 Comparison group 1.0 (Ref.)
 Treated group 0.93 (0.65–1.34) 0.697
 Intervention effect (interaction term) 0.62** (0.45–0.84) 0.002
HFCA-level variables
 Average number of bed nets per sleeping space 4.96* (1.45–16.99) 0.011
 Average number of people per household 0.95* (0.90–1.00) 0.038
Environmental variables
 Rainfall (2 mo. lag) 1.01** (1.01–1.02) <0.001
 NDVI (2 mo. lag) 1.05** (1.04–1.06) <0.001
 Constant 0.00** (0.00–0.00) <0.001
 Observations 542
 Number of HFCAs 13
  1. * p < 0.05, ** p < 0.01
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