condition mean min max ZT0-3 2.9046075 1.3652000000000002 4.444015 ZT4-7 9.8078 9.8078 9.8078 ZT8-11 1.19553 1.19553 1.19553 ZT12-15 0 0 0 ZT16-19 2.6014 2.6014 2.6014 ZT20-23 5.89906 5.89906 5.89906