condition mean min max ZT0-3 0.0035481 0.0035481 0.0035481 ZT4-7 0.0098596 0.0098596 0.0098596 ZT8-11 0.0 0.0 0.0 ZT12-15 0.0 0.0 0.0 ZT16-19 0.0 0.0 0.0 ZT20-23 0.0 0.0 0.0