condition mean min max ZT0-3 0.0348721 0.0348721 0.0348721 ZT4-7 0.0202732 0.0202732 0.0202732 ZT8-11 0.0221701 0.0221701 0.0221701 ZT12-15 0.0 0.0 0.0 ZT16-19 0.0530125 0.0530125 0.0530125 ZT20-23 0.03526525 0.03526525 0.03526525