condition mean min max ZT0-3 297.533368 297.533368 297.533368 ZT4-7 365.3919135 365.3919135 365.3919135 ZT8-11 337.626405 337.626405 337.626405 ZT12-15 259.331109 259.331109 259.331109 ZT16-19 288.2552965 288.2552965 288.2552965 ZT20-23 331.96831799999995 331.96831799999995 331.96831799999995