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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