condition mean min max ZT0-3 186.7135 186.7135 186.7135 ZT4-7 220.6515 220.6515 220.6515 ZT8-11 186.39249999999998 186.39249999999998 186.39249999999998 ZT12-15 173.2225 173.2225 173.2225 ZT16-19 139.78050000000002 139.78050000000002 139.78050000000002 ZT20-23 172.0115 172.0115 172.0115