condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 2.771505 2.771505 2.771505 ZT8-11 0.897015 0.897015 0.897015 ZT12-15 0 0 0 ZT16-19 0.0 0.0 0.0 ZT20-23 1.800975 1.800975 1.800975