condition mean min max ZT0-3 16.67915 15.42275 17.93555 ZT4-7 5.6652000000000005 5.6652000000000005 5.6652000000000005 ZT8-11 4.023625 4.023625 4.023625 ZT12-15 0 0 0 ZT16-19 13.148299999999999 13.148299999999999 13.148299999999999 ZT20-23 11.14775 11.14775 11.14775