condition mean min max ZT0-3 65.047013 65.047013 65.047013 ZT4-7 22.9660505 22.9660505 22.9660505 ZT8-11 16.126393999999998 16.126393999999998 16.126393999999998 ZT12-15 21.449786500000002 21.449786500000002 21.449786500000002 ZT16-19 16.019039 16.019039 16.019039 ZT20-23 15.504110999999998 15.504110999999998 15.504110999999998