condition mean min max ZT0-3 2.72559 0.0 5.53402 ZT4-7 0.0 0.0 0.0 ZT8-11 2.7189 2.7189 2.7189 ZT12-15 5.522955 2.72075 8.32516 ZT16-19 0.0 0.0 0.0 ZT20-23 5.94495 5.94495 5.94495