condition mean min max ZT0-3 48.928313 48.928313 48.928313 ZT4-7 44.1753705 44.1753705 44.1753705 ZT8-11 41.919832 41.919832 41.919832 ZT12-15 31.8928175 31.8928175 31.8928175 ZT16-19 36.37948299999999 36.37948299999999 36.37948299999999 ZT20-23 35.393396 35.393396 35.393396