condition mean min max ZT0-3 178.325924 178.325924 178.325924 ZT4-7 139.79414450000002 139.79414450000002 139.79414450000002 ZT8-11 153.691755 153.691755 153.691755 ZT12-15 152.0821135 152.0821135 152.0821135 ZT16-19 213.21235000000001 213.21235000000001 213.21235000000001 ZT20-23 206.74140549999998 206.74140549999998 206.74140549999998