condition mean min max ZT0-3 2.01408 1.687315 2.340845 ZT4-7 0.8721055 0.8721055 0.8721055 ZT8-11 0.624844 0.624844 0.624844 ZT12-15 0 0 0 ZT16-19 2.15055 2.15055 2.15055 ZT20-23 1.8221 1.8221 1.8221