a strong trendp = 0.053
Although there were no significant differences between groups in the overall analysis ( Χ 2 6 = 9.553; p = 0.1450), we observed that the group of LPS-exposed animals (without stress) had a strong trend ( Χ 2 2 = 5.887; p = 0.053) to have a higher proportion of rats displaying robust cocaine self-administration (greater “Normal acquisition” percentage).