condition mean min max ZT0-3 19.18525 18.386249999999997 19.984250000000003 ZT4-7 36.72645 36.72645 36.72645 ZT8-11 37.72215 37.72215 37.72215 ZT12-15 0 0 0 ZT16-19 21.44055 21.44055 21.44055 ZT20-23 19.7557 19.7557 19.7557