condition mean min max ZT0-3 35.19095 35.19095 35.19095 ZT4-7 15.8256 15.8256 15.8256 ZT8-11 26.5821 26.5821 26.5821 ZT12-15 59.79555 59.79555 59.79555 ZT16-19 51.37465 51.37465 51.37465 ZT20-23 58.592600000000004 58.592600000000004 58.592600000000004