condition mean min max ZT0-3 34.9782318 28.682324899999998 41.2741387 ZT4-7 28.45963922 27.88747033 29.03180811 ZT8-11 22.942352878333335 22.021448106666668 23.86325765 ZT12-15 24.530042795 22.899903730000002 26.16018186 ZT16-19 37.058881783333334 34.696896476666666 39.42086709 ZT20-23 49.20368845 49.18701112666667 49.220365773333334