condition mean min max ZT0-3 0.44091 0.44091 0.44091 ZT4-7 0.319906 0.319906 0.319906 ZT8-11 0.16701950000000002 0.16701950000000002 0.16701950000000002 ZT12-15 0.23560999999999999 0.23560999999999999 0.23560999999999999 ZT16-19 0.3428845 0.3428845 0.3428845 ZT20-23 0.2126905 0.2126905 0.2126905