condition mean min max ZT0-3 12.728998 12.728998 12.728998 ZT4-7 12.2365535 12.2365535 12.2365535 ZT8-11 10.9393545 10.9393545 10.9393545 ZT12-15 10.1732655 10.1732655 10.1732655 ZT16-19 11.7794995 11.7794995 11.7794995 ZT20-23 11.1001535 11.1001535 11.1001535