condition mean min max ZT0-3 27.797333333333334 15.83955 36.82815 ZT4-7 11.96615 11.96615 11.96615 ZT8-11 15.89095 15.89095 15.89095 ZT12-15 25.432225 22.9452 27.919249999999998 ZT16-19 27.980800000000002 27.980800000000002 27.980800000000002 ZT20-23 42.091499999999996 42.091499999999996 42.091499999999996