condition mean min max ZT0-3 0.31516750000000004 0.31516750000000004 0.31516750000000004 ZT4-7 0.266274 0.266274 0.266274 ZT8-11 0.12440119999999999 0.12440119999999999 0.12440119999999999 ZT12-15 0.2261555 0.2261555 0.2261555 ZT16-19 0.406863 0.406863 0.406863 ZT20-23 0.3705015 0.3705015 0.3705015