condition mean min max ZT0-3 0.673387 0.673387 0.673387 ZT4-7 0.9222809999999999 0.9222809999999999 0.9222809999999999 ZT8-11 0.544138 0.544138 0.544138 ZT12-15 0.22939750000000003 0.22939750000000003 0.22939750000000003 ZT16-19 0.6347115000000001 0.6347115000000001 0.6347115000000001 ZT20-23 0.8804035 0.8804035 0.8804035