Fig. 1

Lymphocyte proliferation was decreased by LPS stimulation in the farming group. Lymphocyte proliferation of CBMCs were assessed in the farming (n = 40) and non-farming (n = 80) groups after PHA, PPG, and LPS challenge. Proliferation was assessed by counts per minute (cpm) and then quantified by stimulation index (SI = stimulated LP (cpm)/unstimulated LP (cpm)), which was calculated as the ratio of mean cpm of stimulated over unstimulated replicates. The values are represented as median (25%/75% IQR). Mann–Whitney Rank Sum Test was used to compare the two groups. Statistical significance is indicated by P values < 0.05