condition mean min max ZT0-3 28.464128385000002 21.21992036 35.70833641 ZT4-7 13.879984228833333 12.034351737666666 15.72561672 ZT8-11 7.517990699 5.3601074870000005 9.675873911 ZT12-15 8.072883102 7.880784539666667 8.264981664333334 ZT16-19 7.452369923000001 7.315038322333334 7.589701523666667 ZT20-23 12.1780732245 9.270104299 15.086042149999999