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Table 4 A comparison of parous An. gambiae s.l. collected from IRS and non-IRS districts between 2011 and 2014

From: A reduction in malaria transmission intensity in Northern Ghana after 7 years of indoor residual spraying

Study district/year compared Compared parity rate (%) % Change Pooled sample proportion Standard error Z test statistic p value Remark
Savelugu Nanton District (SND)
 2011–2012 44.8 → 37.4% −16.5 0.421 0.029 2.549 0.011* Change from ACP to PM
 2012–2013 37.4 → 27.5% −26.5 0.324 0.031 3.222 0.001* Sprayed with PM
 2013–2014 27.5 → 28.1% +2.1 0.277 0.034 −0.168 0.867 Sprayed with PM
Tolon Kumbungu District (TKD)
 2011–2012 53.3 → 46.6% −12.6 0.499 0.021 3.242 0.001* IRS continued with ACP
 2012–2013 46.6 → 50.4% +8.0 0.490 0.018 −2.071 0.038 IRS withdrawn
 2013–2014 50.4 → 68.5% +36.0 0.567 0.019 −9.793 0.000* IRS withdrawn
Tamale Metropolis (TML)
 2011–2012 68.6 → 65.8% −4.1 0.671 0.016 1.730 0.084 No IRS
 2012–2013 65.8 → 64.3% −2.2 0.649 0.015 0.991 0.322 No IRS
 2013–2014 64.3 → 72.3% +12.5 0.681 0.013 −6.113 0.000* No IRS
  1. ACP alpha-cypermethrin, PM pirimiphos-methyl
  2. * p value significant at 0.05 significance level; −ve% represents percentage reduction; +ve% represents percentage increase