condition mean min max ZT0-3 5.423873092166667 5.306093885999999 5.541652298333334 ZT4-7 4.279610341666666 2.696849995 5.862370688333334 ZT8-11 7.059474717166666 6.311856515 7.807092919333333 ZT12-15 6.667556933 6.22534844 7.109765426 ZT16-19 7.157083394666667 7.057198084 7.256968705333334 ZT20-23 10.758493915999999 7.710960002999999 13.806027829