condition mean min max ZT0-3 0.0 0.0 0.0 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 0.014850893 0.0 0.029701786 ZT20-23 0.016806400000000003 0.0 0.033612800000000005