An observational analysis of the impact of indoor residual spraying in Northern, Upper East, and Upper West Regions of Ghana: 2014 through 2017

Table 5 Estimated Impact of IRS with Actellic^®300CS in Northern Region, 2015–2017

Year	6-month cumulative incidence (May–Oct; per 10,000 person-months at risk)
Year	Non-IRS Districts	IRS Districts	Cumulative Fewer Cases	Average population in IRS districts	Total population in IRS districts^a	Cases averted
2015	2340	1438	901 (39%)	103,945	519,725	56,218
2016	2401	1779	623 (26%)	103,958	519,792	38,834
2017	4337	1830	2507 (58%)	107,738	754,168^b	162,072
Total	9078	5047	4031 (44%)	315,641	1793,6685	257,124

^aOut of total estimated Northern Region population—2015: 2,874,374; 2016: 2,960,606; 2017: 3,049,424
^bIn 2017 two additional districts were sprayed, hence the increase in IRS district population

ISSN: 1475-2875