TPPP and cystic fibrosis: Tukey’s honest significant difference test for multiple comparisons found that mean LD activity per hour was different between CF and WT (P = < 0.001, 95% C.I. [−10.25, 1.24]) and Tppp−/− and WT (P = < 0.001, 95% C.I. [−7.76, 1.24]).