condition mean min max ZT0-3 0.04152525 0.0 0.0830505 ZT4-7 0.081993 0.081993 0.081993 ZT8-11 0.082276 0.082276 0.082276 ZT12-15 0 0 0 ZT16-19 0.0819985 0.0819985 0.0819985 ZT20-23 0.165189 0.165189 0.165189