condition mean min max ZT0-3 259.520303 259.520303 259.520303 ZT4-7 167.1749135 167.1749135 167.1749135 ZT8-11 182.0003585 182.0003585 182.0003585 ZT12-15 217.351596 217.351596 217.351596 ZT16-19 311.770045 311.770045 311.770045 ZT20-23 336.28294900000003 336.28294900000003 336.28294900000003