condition mean min max ZT0-3 125.094859 125.094859 125.094859 ZT4-7 180.1093975 180.1093975 180.1093975 ZT8-11 225.436418 225.436418 225.436418 ZT12-15 177.376067 177.376067 177.376067 ZT16-19 179.5789005 179.5789005 179.5789005 ZT20-23 161.5154665 161.5154665 161.5154665