condition mean min max ZT0-3 221.04675 221.04675 221.04675 ZT4-7 307.0603555 307.0603555 307.0603555 ZT8-11 321.8504915 321.8504915 321.8504915 ZT12-15 292.1265425 292.1265425 292.1265425 ZT16-19 335.83880999999997 335.83880999999997 335.83880999999997 ZT20-23 324.324483 324.324483 324.324483