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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