condition mean min max ZT0-3 38.77275 34.93755 42.60795 ZT4-7 26.46525 26.46525 26.46525 ZT8-11 18.32695 18.32695 18.32695 ZT12-15 0 0 0 ZT16-19 36.6148 36.6148 36.6148 ZT20-23 46.35785 46.35785 46.35785