condition mean min max ZT0-3 0.023326867 0.0 0.046653734 ZT4-7 0.0700830655 0.0 0.140166131 ZT8-11 0.063837595 0.051746632 0.075928558 ZT12-15 0.06309948425 0.037778908 0.08842006050000001 ZT16-19 0.0 0.0 0.0 ZT20-23 0.07419107474999999 0.04822144 0.10016070949999999