condition mean min max ZT0-3 14.215071666666667 11.078015 16.3714 ZT4-7 10.16135 10.16135 10.16135 ZT8-11 7.82471 7.82471 7.82471 ZT12-15 10.7061825 10.6206 10.791765000000002 ZT16-19 13.80045 13.80045 13.80045 ZT20-23 18.4032 18.4032 18.4032