condition mean min max ZT0-3 19.498195 19.498195 19.498195 ZT4-7 43.6589625 43.6589625 43.6589625 ZT8-11 61.690754 61.690754 61.690754 ZT12-15 45.1383915 45.1383915 45.1383915 ZT16-19 40.326398499999996 40.326398499999996 40.326398499999996 ZT20-23 38.206054 38.206054 38.206054