condition mean min max ZT0-3 0.48411000000000004 0.48411000000000004 0.48411000000000004 ZT4-7 0.311738 0.311738 0.311738 ZT8-11 0.16716150000000002 0.16716150000000002 0.16716150000000002 ZT12-15 0.09009245 0.09009245 0.09009245 ZT16-19 0.0 0.0 0.0 ZT20-23 0.049928 0.049928 0.049928