condition mean min max ZT0-3 0.82099 0.82099 0.82099 ZT4-7 0.2434971 0.2434971 0.2434971 ZT8-11 0.5322749999999999 0.5322749999999999 0.5322749999999999 ZT12-15 0.40837233333333334 0.40837233333333334 0.40837233333333334 ZT16-19 0.581831 0.581831 0.581831 ZT20-23 0.652487 0.652487 0.652487