Respiratory syncytial virus bronchiolitis, weather conditions and air pollution in an Italian urban area: An observational study.

2 shows the 95% confidence intervals of the month effect on the expected log count: as expected, a decreasing trend is evident with a significant decrease of the RSV positive patient in spring and in autumn.

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Another important issue is that, insofar as infants spend the majority of their time inside the home, some variables such as ventilation, gas or oil heating or cooking, may be significant unmeasured confounders or causative agents.

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