condition mean min max ZT0-3 202.082788 202.082788 202.082788 ZT4-7 202.700226 202.700226 202.700226 ZT8-11 159.199907 159.199907 159.199907 ZT12-15 144.675096 144.675096 144.675096 ZT16-19 356.92653399999995 356.92653399999995 356.92653399999995 ZT20-23 615.1787495 615.1787495 615.1787495