condition mean min max ZT0-3 10.632941666666666 6.267775 13.335799999999999 ZT4-7 3.73855 3.73855 3.73855 ZT8-11 4.466335 4.466335 4.466335 ZT12-15 13.262550000000001 12.57765 13.94745 ZT16-19 12.47805 12.47805 12.47805 ZT20-23 16.52065 16.52065 16.52065