condition mean min max ZT0-3 69.544872 69.544872 69.544872 ZT4-7 237.7261495 237.7261495 237.7261495 ZT8-11 312.169117 312.169117 312.169117 ZT12-15 276.373612 276.373612 276.373612 ZT16-19 138.5402345 138.5402345 138.5402345 ZT20-23 66.3341805 66.3341805 66.3341805