condition mean min max ZT0-3 11.3330375 10.351925 12.314150000000001 ZT4-7 15.2193 15.2193 15.2193 ZT8-11 7.2667850000000005 7.2667850000000005 7.2667850000000005 ZT12-15 0 0 0 ZT16-19 18.80105 18.80105 18.80105 ZT20-23 16.526400000000002 16.526400000000002 16.526400000000002