condition mean min max ZT0-3 110.520294 110.520294 110.520294 ZT4-7 124.453609 124.453609 124.453609 ZT8-11 74.2214885 74.2214885 74.2214885 ZT12-15 78.5039735 78.5039735 78.5039735 ZT16-19 63.781352999999996 63.781352999999996 63.781352999999996 ZT20-23 72.9645855 72.9645855 72.9645855