condition mean min max ZT0-3 9.154217 9.154217 9.154217 ZT4-7 10.258118 10.258118 10.258118 ZT8-11 11.046972 11.046972 11.046972 ZT12-15 10.1910885 10.1910885 10.1910885 ZT16-19 12.530178 12.530178 12.530178 ZT20-23 9.5070425 9.5070425 9.5070425