condition mean min max ZT0-3 0.18891025 0.124553 0.2532675 ZT4-7 0.04298455 0.04298455 0.04298455 ZT8-11 0.0834735 0.0834735 0.0834735 ZT12-15 0 0 0 ZT16-19 0.0415959 0.0415959 0.0415959 ZT20-23 0.08344635 0.08344635 0.08344635