condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.014463 0.014463 0.014463 ZT8-11 0.03943505 0.03943505 0.03943505 ZT12-15 0.0526859 0.0526859 0.0526859 ZT16-19 0.0637609 0.0637609 0.0637609 ZT20-23 0.0503169 0.0503169 0.0503169