Table 7.

Negative binomial regression analysis on monthly outpatient laboratory-confirmed malaria cases (either RDT or microscopy) and total malaria cases (both confirmed and clinical, intervention and control difference-in-difference analysis, 2011–2013^*

Factor	Coefficient	Confirmed malaria cases	Total malaria cases
		IRR (95% CI)	IRR (95% CI)
Intervention group	Control	Reference	Reference
	Intervention	0.86 (0.67–1.11)	0.92 (0.73–1.17)
		P = 0.257	P = 0.556
Time period	Pre-intervention	Reference	Reference
	Post-intervention (after May 2012)	0.89 (0.78–1.01)	1.09 (0.97–1.22)
		P = 0.064	P = 0.145
Interaction	Time by intervention group interaction (DiD)	0.83 (0.68–1.01)	0.65 (0.54–0.78)
		P = 0.072	P < 0.001

RDT = rapid diagnostic test; IRR = incidence rate ratio; DiD = difference-in-differences.

^*Model controls for laboratory testing rates, previous months' incidence and calendar month (not shown).