condition mean min max ZT0-3 46.56263333333333 46.56263333333333 46.56263333333333 ZT4-7 37.96425 37.96425 37.96425 ZT8-11 25.377499999999998 25.377499999999998 25.377499999999998 ZT12-15 31.43425 31.43425 31.43425 ZT16-19 40.660199999999996 40.660199999999996 40.660199999999996 ZT20-23 45.2606 45.2606 45.2606