condition mean min max ZT0-3 30.12993388 24.54351518 35.71635258 ZT4-7 32.486503802499996 31.30765772 33.665349885 ZT8-11 32.022603105 31.22027746 32.82492875 ZT12-15 51.1797727025 47.267314505 55.092230900000004 ZT16-19 74.75982766749999 72.23678248 77.282872855 ZT20-23 88.1061302225 82.97857081999999 93.23368962500001