condition mean min max ZT0-3 14.984206 14.984206 14.984206 ZT4-7 15.389776999999999 15.389776999999999 15.389776999999999 ZT8-11 13.9692625 13.9692625 13.9692625 ZT12-15 12.624224000000002 12.624224000000002 12.624224000000002 ZT16-19 11.168899499999998 11.168899499999998 11.168899499999998 ZT20-23 13.08553 13.08553 13.08553