condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.017064199999999998 0.017064199999999998 0.017064199999999998 ZT8-11 0.016475766666666666 0.016475766666666666 0.016475766666666666 ZT12-15 0.0060782125 0.0 0.012156425 ZT16-19 0.0 0.0 0.0 ZT20-23 0 0 0