condition mean min max ZT0-3 0.01769747125 0.0 0.0353949425 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 0.023350020833333332 0.016889673666666664 0.029810368 ZT20-23 0.0 0.0 0.0