condition mean min max ZT0-3 0.08135906666666667 0.03777025 0.1272145 ZT4-7 1.4971885 1.4971885 1.4971885 ZT8-11 4.90536 4.90536 4.90536 ZT12-15 2.6682949999999996 1.93772 3.3988699999999996 ZT16-19 0.589072 0.589072 0.589072 ZT20-23 0.2867805 0.2867805 0.2867805