condition mean min max ZT0-3 2.8510625000000003 2.471655 3.23047 ZT4-7 1.91681 1.91681 1.91681 ZT8-11 0.9134625000000001 0.9134625000000001 0.9134625000000001 ZT12-15 0 0 0 ZT16-19 1.7588599999999999 1.7588599999999999 1.7588599999999999 ZT20-23 2.851485 2.851485 2.851485