condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.005155275 0.005155275 0.005155275 ZT8-11 0.0032004725 0.0032004725 0.0032004725 ZT12-15 0.0034359833333333333 0.0034359833333333333 0.0034359833333333333 ZT16-19 0.015585074999999999 0.015585074999999999 0.015585074999999999 ZT20-23 0.0103344 0.0103344 0.0103344