highly significantP<0.001
One-way ANOVAs found highly significant differences in bacterial abundance among cities ( Table 1: F 2,495 = 31.71; P<0.001), between the offices inhabited by men and women ( F 1,495 = 10.295; P = 0.001) and among office surfaces ( F 4,495 = 10.661; P<0.001).