condition mean min max ZT0-3 45.46893333333333 35.6729 50.7132 ZT4-7 22.9648 22.9648 22.9648 ZT8-11 14.70795 14.70795 14.70795 ZT12-15 26.25315 24.8091 27.697200000000002 ZT16-19 27.7462 27.7462 27.7462 ZT20-23 33.51375 33.51375 33.51375