condition mean min max ZT0-3 0.23890050000000002 0.23890050000000002 0.23890050000000002 ZT4-7 0.0376384 0.0376384 0.0376384 ZT8-11 0.0985631 0.0985631 0.0985631 ZT12-15 0.14035599999999998 0.14035599999999998 0.14035599999999998 ZT16-19 0.415471 0.415471 0.415471 ZT20-23 0.3621215 0.3621215 0.3621215