condition mean min max ZT0-3 0.024692 0.024692 0.024692 ZT4-7 0.0050124666666666665 0.0050124666666666665 0.0050124666666666665 ZT8-11 0.0 0.0 0.0 ZT12-15 0.018285700000000002 0.018285700000000002 0.018285700000000002 ZT16-19 0.0 0.0 0.0 ZT20-23 0.0 0.0 0.0