condition mean min max ZT0-3 38.570554 38.570554 38.570554 ZT4-7 27.297233 27.297233 27.297233 ZT8-11 40.818756500000006 40.818756500000006 40.818756500000006 ZT12-15 46.496696 46.496696 46.496696 ZT16-19 97.80958000000001 97.80958000000001 97.80958000000001 ZT20-23 159.796551 159.796551 159.796551