condition mean min max ZT0-3 0.032318475 0.03226795 0.032369 ZT4-7 0.2888465 0.2888465 0.2888465 ZT8-11 0.1607595 0.1607595 0.1607595 ZT12-15 0 0 0 ZT16-19 0.19090449999999998 0.19090449999999998 0.19090449999999998 ZT20-23 0.287477 0.287477 0.287477