condition mean min max ZT0-3 19.403525 17.629849999999998 21.1772 ZT4-7 12.95685 12.95685 12.95685 ZT8-11 16.294 16.294 16.294 ZT12-15 0 0 0 ZT16-19 23.35205 23.35205 23.35205 ZT20-23 17.02995 17.02995 17.02995