condition mean min max ZT0-3 450.422004 450.422004 450.422004 ZT4-7 381.945406 381.945406 381.945406 ZT8-11 354.596376 354.596376 354.596376 ZT12-15 367.951211 367.951211 367.951211 ZT16-19 341.6044515 341.6044515 341.6044515 ZT20-23 346.321918 346.321918 346.321918