condition mean min max ZT0-3 18.609325 16.9415 20.27715 ZT4-7 14.387250000000002 14.387250000000002 14.387250000000002 ZT8-11 20.65205 20.65205 20.65205 ZT12-15 0 0 0 ZT16-19 26.79535 26.79535 26.79535 ZT20-23 27.82065 27.82065 27.82065