condition mean min max ZT0-3 17.730136666666667 10.94786 21.714550000000003 ZT4-7 7.854290000000001 7.854290000000001 7.854290000000001 ZT8-11 10.45623 10.45623 10.45623 ZT12-15 19.980725 17.8796 22.08185 ZT16-19 17.60635 17.60635 17.60635 ZT20-23 26.74625 26.74625 26.74625