condition mean min max ZT0-3 0.0718816 0.0511842 0.1130256 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.032219950000000004 0.01375065 0.050689250000000005 ZT16-19 0.023593999999999997 0.023593999999999997 0.023593999999999997 ZT20-23 0.0803297 0.0803297 0.0803297