condition mean min max ZT0-3 16.00575 15.43385 16.57765 ZT4-7 14.723299999999998 14.723299999999998 14.723299999999998 ZT8-11 8.004795 8.004795 8.004795 ZT12-15 0 0 0 ZT16-19 11.198094999999999 11.198094999999999 11.198094999999999 ZT20-23 15.25625 15.25625 15.25625