condition mean min max ZT0-3 22.549999999999997 22.549999999999997 22.549999999999997 ZT4-7 13.8 13.8 13.8 ZT8-11 7.8500000000000005 7.8500000000000005 7.8500000000000005 ZT12-15 12.2 12.2 12.2 ZT16-19 48.6 48.6 48.6 ZT20-23 72.05 72.05 72.05