condition mean min max ZT0-3 0.0402185 0.0402185 0.0402185 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 0.243458 0.243458 0.243458 ZT20-23 0.506478 0.506478 0.506478