condition mean min max ZT0-3 0.033612 0.0 0.0517375 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.024907625 0.0 0.04981525 ZT16-19 0.0 0.0 0.0 ZT20-23 0.0510605 0.0510605 0.0510605