condition mean min max ZT0-3 22.866434 22.866434 22.866434 ZT4-7 28.9610955 28.9610955 28.9610955 ZT8-11 33.916779000000005 33.916779000000005 33.916779000000005 ZT12-15 36.174432 36.174432 36.174432 ZT16-19 33.8832325 33.8832325 33.8832325 ZT20-23 32.702009000000004 32.702009000000004 32.702009000000004