condition mean min max ZT0-3 24.353687 24.353687 24.353687 ZT4-7 22.946488000000002 22.946488000000002 22.946488000000002 ZT8-11 22.590659000000002 22.590659000000002 22.590659000000002 ZT12-15 25.9730355 25.9730355 25.9730355 ZT16-19 22.812528999999998 22.812528999999998 22.812528999999998 ZT20-23 29.504601 29.504601 29.504601