condition mean min max ZT0-3 0.004472703 0.0 0.008945406 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0099219205 0.0 0.019843841 ZT12-15 0.016953699 0.0 0.033907398 ZT16-19 0.0 0.0 0.0 ZT20-23 0.01719644 0.015188024 0.019204856