condition mean min max ZT0-3 57.297113064166666 54.34036422333333 60.253861905 ZT4-7 67.926432105 65.23751719 70.61534702 ZT8-11 82.515679035 80.12034488 84.91101319 ZT12-15 89.52667255166666 85.97472329666667 93.07862180666666 ZT16-19 77.81337253 71.67056425999999 83.9561808 ZT20-23 70.49202489999999 64.55274093666667 76.43130886333333