condition mean min max ZT0-3 0.1133605 0.0 0.226721 ZT4-7 2.026764 2.026764 2.026764 ZT8-11 7.492844999999999 7.492844999999999 7.492844999999999 ZT12-15 0 0 0 ZT16-19 3.5671049999999997 3.5671049999999997 3.5671049999999997 ZT20-23 1.572454 1.572454 1.572454