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Table 3 Comparison of malaria incidence

From: Effect of trimethoprim-sulphamethoxazole on the risk of malaria in HIV-infected Ugandan children living in an area of widespread antifolate resistance

Time Period HIV-uninfected HIV-infected IRR (95% C.I)
  Episodes Person time (yrs) Incidence Episodes Person time Incidence  
Aug 1st 06 - Dec 15th 08 491 1095 0.45/psnyr 65 665 0.10/psnyr 0.20 (0.15-0.28)
Aug 1st 06 - May 15th 07 267 397 0.67/psnyr 28 224 0.13/psnyr 0.19 (0.12-0.28)
May 16th 07 - Feb 29th 08 132 364 0.36/psnyr 23 222 0.10/psnyr 0.26 (0.15-0.43)
Mar 1st 08 - Dec 15th 08 92 334 0.28/psnyr 14 220 0.06/psnyr 0.20 (0.10-0.38)
  1. *Incident Rate Ratio controlling for age at beginning each observation period