condition mean min max ZT0-3 88.2658112 81.79762310000001 94.73399930000001 ZT4-7 20.670570524749998 13.2797265345 28.061414515 ZT8-11 22.319005265 15.32738295 29.310627580000002 ZT12-15 37.627536899999996 35.04753337 40.20754043 ZT16-19 54.558054007500004 50.303554875 58.81255314 ZT20-23 63.080897415 61.912759545 64.249035285