condition mean min max ZT0-3 241.85000000000002 241.85000000000002 241.85000000000002 ZT4-7 248.6 248.6 248.6 ZT8-11 256.3 256.3 256.3 ZT12-15 451.15 451.15 451.15 ZT16-19 496.34999999999997 496.34999999999997 496.34999999999997 ZT20-23 367.5 367.5 367.5