condition mean min max ZT0-3 122.82757 122.82757 122.82757 ZT4-7 209.418075 209.418075 209.418075 ZT8-11 135.265126 135.265126 135.265126 ZT12-15 141.4984485 141.4984485 141.4984485 ZT16-19 107.8539045 107.8539045 107.8539045 ZT20-23 97.849153 97.849153 97.849153