condition mean min max ZT0-3 8.51757 8.51757 8.51757 ZT4-7 6.552905000000001 6.552905000000001 6.552905000000001 ZT8-11 6.855195 6.855195 6.855195 ZT12-15 8.125415 8.125415 8.125415 ZT16-19 10.28154 10.28154 10.28154 ZT20-23 8.640979999999999 8.640979999999999 8.640979999999999