condition mean min max ZT0-3 549.042497 549.042497 549.042497 ZT4-7 1061.782531 1061.782531 1061.782531 ZT8-11 828.9449 828.9449 828.9449 ZT12-15 591.9519825 591.9519825 591.9519825 ZT16-19 605.2940325 605.2940325 605.2940325 ZT20-23 796.4107945 796.4107945 796.4107945