condition mean min max ZT0-3 7.335794999999999 7.211444999999999 7.460145 ZT4-7 5.18114 5.18114 5.18114 ZT8-11 5.306955 5.306955 5.306955 ZT12-15 0 0 0 ZT16-19 6.6351700000000005 6.6351700000000005 6.6351700000000005 ZT20-23 5.62518 5.62518 5.62518