condition mean min max ZT0-3 0.9189566666666666 0.0 1.39754 ZT4-7 2.566705 2.566705 2.566705 ZT8-11 0.0 0.0 0.0 ZT12-15 0.0 0.0 0.0 ZT16-19 0.62917 0.62917 0.62917 ZT20-23 0.0 0.0 0.0