condition mean min max ZT0-3 0.0133735 0.0 0.026747 ZT4-7 0.05352885 0.05352885 0.05352885 ZT8-11 0.0 0.0 0.0 ZT12-15 0 0 0 ZT16-19 0.0 0.0 0.0 ZT20-23 0.0265172 0.0265172 0.0265172