condition mean min max ZT0-3 22.884674999999998 20.813499999999998 24.955849999999998 ZT4-7 31.52895 31.52895 31.52895 ZT8-11 60.2564 60.2564 60.2564 ZT12-15 0 0 0 ZT16-19 70.83815 70.83815 70.83815 ZT20-23 52.455600000000004 52.455600000000004 52.455600000000004