condition mean min max ZT0-3 0.01798642925 0.0 0.0359728585 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.0 0.0 0.0 ZT16-19 0.0219882235 0.020149424000000003 0.023827023000000003 ZT20-23 0.020804465833333334 0.0 0.04160893166666667