condition mean min max ZT0-3 0.4806821666666667 0.0 0.858028 ZT4-7 0.0 0.0 0.0 ZT8-11 0.5749569999999999 0.5749569999999999 0.5749569999999999 ZT12-15 0.30274125 0.287127 0.3183555 ZT16-19 1.3504135 1.3504135 1.3504135 ZT20-23 0.6162055 0.6162055 0.6162055