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Table 4 Interaction ratios for observed effects compared to expected effects

From: Combining next-generation indoor residual spraying and drug-based malaria control strategies: observational evidence of a combined effect in Mali

  All ages    Under 5   
  IRS + SMC IRS + SMC Interaction ratio IRS + SMC IRS + SMC Interaction ratio
Month Expected impact (%)1 Observed impact (%) Observed/expected Expected impact (%)1 Observed impact (%) Observed/expected
14-Sep 47 63 1.33 63 73 1.17
14-Oct 36% 30 0.85 46 47 1.02
14-Nov 4% 3 1.55 16 12 0.74
14-Dec 74% 44 0.59 85 55 0.64
15-Jan 52% 44 0.86 70 56 0.8
15-Feb 47% 50 1.05 75 69 0.92
Average 43% 39 0.9 59 52 0.88
  1. 1EfficacyIRS x (1-EfficacySMC) + EfficacySMC
  2. SMC Seasonal Malaria Chemoprevention, IRS Indoor Residual Spray