condition mean min max ZT0-3 63.1195000775 47.859723715 78.37927644 ZT4-7 21.5819574575 20.806037925 22.35787699 ZT8-11 22.0573440475 17.979917 26.134771094999998 ZT12-15 21.89188651 20.76837424 23.015398779999998 ZT16-19 21.93867168 20.89531683 22.98202653 ZT20-23 23.858389862499997 23.493760965 24.22301876