Fig. 1

ROC curves for prediction models to discriminate rhinitis and Ascaris infection. Model 1 adjusted for age, sex, residence, parent’s education, mother occupation; model 2 adjusted for model 1 and family atopic history; model 3 adjusted for model 2 and parent’s smoking. Results show that variables in model 3 can explain 86.6% of the variance of the rhinitis. Therefore, this model is valid and considered as final model to multivariate analysis. The Hosmer and Lemeshow test also confirms the accuracy of the final model (P = 0.74). In the final modeling (model 3), sensitivity, specificity and accuracy for predicting rhinitis/healthy status were 71.6, 84.0 and 78.6%, respectively