Table 4.

Odds Ratios and 95% credible intervals for the risk of trachoma signs (n = 3,324)-adjusted for host age and gender in 21 school sentinel sites in Burkina Faso

	Simple hierarchical logistic regression models	Final multivariable hierarchical logistic regression model
Environmental and weather variables	ORs (95% Credible Intervals)	ORs (95% Credible Intervals)
Altitude*	1.730 (1.189 - 2.433)	REM
Precipitation◊	1.690 (1.336 - 2.016)	REM
Min temperature‡	0.570 (0.546 - 0.591)	0.746 (0.717 - 0.768)
Max temperature♦	0.465 (0.436 - 0.484)	NI
Av temperature‡	0.580 (0.564 - 0.591)	NI
Air pressure▲	0.606 (0.602 - 0.609)	0.616 (0.608 - 0.622)

NI: These variables were not included in the final multivariate binomial logistic regression model building as DIC indicated poorer fit than when min temperature was included.

REM: The effects of these variables were removed as DIC indicated by backward elimination

*per 50 MSL: Meters above sea level; ^◊ per 0.5 mm: millimeters; ^♦ per 1°C: Celsius; ^‡ per 0.5°C: Celsius; ^▲ per 5 mbars: millibars