condition mean min max ZT0-3 394.696959 394.696959 394.696959 ZT4-7 601.219234 601.219234 601.219234 ZT8-11 587.80325 587.80325 587.80325 ZT12-15 634.68737 634.68737 634.68737 ZT16-19 738.243882 738.243882 738.243882 ZT20-23 623.284814 623.284814 623.284814