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Table 4 Risk of clinically diagnosed malaria in hyperendemic and mesoendemic catchments during the peak malaria season (February – May).

From: Association of house spraying with suppressed levels of drug resistance in Zimbabwe

Year 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003
Hyperendemic population (elev. <600 m) 21306 21925 22643 34298 35733 27647 25578 22651 27174 27989
Mesoendemic population (elev. ≥600 m) 65664 66497 69788 75761 88181 90910 93721 48244 96057 61625
Malarial RR (95% CI) 1.9 (1.72 – 1.99) 1.7 (1.57 – 1.81) 5.3 (5.09 – 5.55) 2.8 (2.67 – 2.88) 1.1 (1.09 – 1.17) 5.0 (4.82 – 5.12) 2.0 (1.89 – 2.04) 2.7 (2.56 – 2.75) 1.6 (1.55 – 1.69) 3.3 (3.06 – 3.48)
P <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001