condition mean min max ZT0-3 25.321161744166666 22.251091695 28.391231793333333 ZT4-7 20.819062244999998 20.360759703333333 21.277364786666666 ZT8-11 28.755869115000003 26.909354450000002 30.60238378 ZT12-15 35.432469435 30.76995593 40.09498294 ZT16-19 39.364105126666665 36.92679182333333 41.80141843 ZT20-23 33.673371925 31.50455037 35.84219348