APOA1 and infection: Older age was negatively correlated with the infection (56 y/o vs. 54 y/o, p < 0.001) for the HDL group, while it was not significant for the apoA1 group (53.6 y/o vs. 53.0 y/o, p = 0.36), the latter result possibly obtained because of the smaller sample size and biased sampling of age groups in the apoA1 group.