condition mean min max ZT0-3 10.765492 10.765492 10.765492 ZT4-7 12.18043 12.18043 12.18043 ZT8-11 12.027999 12.027999 12.027999 ZT12-15 11.382542 11.382542 11.382542 ZT16-19 11.9587885 11.9587885 11.9587885 ZT20-23 11.545396 11.545396 11.545396