condition mean min max ZT0-3 202.644333 202.644333 202.644333 ZT4-7 192.62082049999998 192.62082049999998 192.62082049999998 ZT8-11 211.8434935 211.8434935 211.8434935 ZT12-15 236.4943975 236.4943975 236.4943975 ZT16-19 226.0375185 226.0375185 226.0375185 ZT20-23 277.1827545 277.1827545 277.1827545