condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 7.132845 7.132845 7.132845 ZT8-11 0.0 0.0 0.0 ZT12-15 0.0 0.0 0.0 ZT16-19 2.096905 2.096905 2.096905 ZT20-23 3.08929 3.08929 3.08929