condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.0 0.0 0.0 ZT16-19 0.007674458166666668 0.0 0.015348916333333336 ZT20-23 0.008213077000000001 0.0 0.016426154000000002