condition mean min max ZT0-3 17.428125 16.73675 18.119500000000002 ZT4-7 14.5515 14.5515 14.5515 ZT8-11 25.69455 25.69455 25.69455 ZT12-15 0 0 0 ZT16-19 24.6326 24.6326 24.6326 ZT20-23 21.3986 21.3986 21.3986