Table 1

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

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

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)

Carme Malaria Journal 2009 8:280   doi:10.1186/1475-2875-8-280