condition mean min max ZT0-3 0.991505 0.0 2.974515 ZT4-7 0.0 0.0 0.0 ZT8-11 3.066435 3.066435 3.066435 ZT12-15 0.0 0.0 0.0 ZT16-19 0.0 0.0 0.0 ZT20-23 0.0 0.0 0.0