condition mean min max ZT0-3 8.1170825 6.377385 9.85678 ZT4-7 2.37744 2.37744 2.37744 ZT8-11 3.90272 3.90272 3.90272 ZT12-15 0 0 0 ZT16-19 3.67748 3.67748 3.67748 ZT20-23 5.874385 5.874385 5.874385