condition mean min max ZT0-3 9.062018333333333 6.216115 10.611799999999999 ZT4-7 5.78654 5.78654 5.78654 ZT8-11 5.53758 5.53758 5.53758 ZT12-15 9.1604225 8.943315 9.37753 ZT16-19 8.037135 8.037135 8.037135 ZT20-23 13.342649999999999 13.342649999999999 13.342649999999999