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Table 1 Risk factors of first malaria attack in Amerindian children [2]

From: Malaria or kalimbe: how to choose?

   Hazard Ratio 95%CI p
Vegetation around the home: % cleared < 50% 1   
  50--75% 0.62 0.43--0.88 0.008
  > 75% 0.5 0.31--0.81 0.005
Distance from the home to the river < 20 m 1   
  20--40 m 0.56 0.37--0.85 0.006
  40--80 m 0.72 0.47--1.09 0.128
  80--120 m 0.52 0.28--0.94 0.033
  > 120 m 0.5 0.30--0.86 0.012
Home: number of occupants ≤ 6 1   
  7 1.54 0.98--2.44 0.061
  8--11 1.9 1.29--2.81 0.001
  > 11 2.03 1.27--3.23 0.003
Ethnicity Emerillon 1   
  Wayampi 0.552 0.401--0.796 < 0.001
Clothing Kalimbe 1   
  Modern 0.64 0.46--0.90 0.011
  1. Results for the multivariate Cox model, stratified for year of birth (saturated model with 23 variables which were significant at p > 0.25 in univariate analysis. The most parsimonious model was selected manually using log-likelyhood ratio test). Automated forward and backward stepwise elimination were consistent with the manual procedure above. Analysis time: 563.68 person-years. Proportional hazards assumption was checked (Schoenfeld: p = 0.862)