A crossover study to evaluate the diversion of malaria vectors in a community with incomplete coverage of spatial repellents in the Kilombero Valley, Tanzania

Table 6 Effect of different spatial repellent coverage scenarios on household densities of blood-fed mosquitoes

	N^a	n^b	IRR^c	95 % CI-IRR^d	P-value
Anopheles arabiensis
No coverage	54 (18)	252	1	–	–
Complete coverage	54 (18)	202	0.91	0.68–1.21	0.59
Incomplete coverage: repellent users	108 (36)	363	0.89	0.67–1.18	0.34
Incomplete coverage: repellent non-users	108 (36)	133	0.86	0.62–1.19	0.32
Anopheles funestus
No coverage	54 (18)	124	1	–	–
Complete coverage	54 (18)	226	1.35	1.01–1.80	0.04
Incomplete coverage: repellent users	108 (36)	289	1.39	1.04–1.86	0.02
Incomplete coverage: repellent non-users	108 (36)	139	1.27	0.91–1.76	0.15
Culex spp.
No coverage	54 (18)	478	1	–	–
Complete coverage	54 (18)	301	0.80	0.60–1.06	0.11
Incomplete coverage: repellent users	108 (36)	634	1.04	0.79–1.37	0.78
Incomplete coverage: repellent non-users	108 (36)	262	1.15	0.84–1.58	0.39

^aN, number of days assigned to each coverage scenario (number of weeks)
^bn, sum of the total number of blood fed mosquitoes collected resting indoors and outdoors per coverage scenario
^cIRR, Incidence Rate Ratio
^d95 %-IRR, 95 % confidence interval of incidence rate ratio

ISSN: 1756-3305