condition mean min max ZT0-3 12.433225 10.835999999999999 14.03045 ZT4-7 8.328355 8.328355 8.328355 ZT8-11 4.586320000000001 4.586320000000001 4.586320000000001 ZT12-15 0 0 0 ZT16-19 4.8204 4.8204 4.8204 ZT20-23 8.67883 8.67883 8.67883