condition mean min max ZT0-3 167.36416666666668 134.3845 188.465 ZT4-7 127.019 127.019 127.019 ZT8-11 164.8875 164.8875 164.8875 ZT12-15 213.09175 208.5515 217.632 ZT16-19 228.70850000000002 228.70850000000002 228.70850000000002 ZT20-23 230.227 230.227 230.227