condition mean min max ZT0-3 778.198585 778.198585 778.198585 ZT4-7 605.1471605 605.1471605 605.1471605 ZT8-11 630.793239 630.793239 630.793239 ZT12-15 540.543127 540.543127 540.543127 ZT16-19 606.112535 606.112535 606.112535 ZT20-23 808.2312294999999 808.2312294999999 808.2312294999999