Exposure to livestock in the study population.

<p>Case (P-ADC) and control (non-P-ADC) groups were compared using univariate analysis with the Chi-2 test.</p

Factors independently associated with pneumonic-type lung adenocarcinoma.

<p>Multivariate analysis was performed using log regression model including significant variables at univariate analysis with <i>p</i><0.15.</p><p>CI: Confidence Interval.</p