condition mean min max ZT0-3 0.343553 0.173958 0.5131479999999999 ZT4-7 0.26277300000000003 0.26277300000000003 0.26277300000000003 ZT8-11 0.085976 0.085976 0.085976 ZT12-15 0 0 0 ZT16-19 0.257057 0.257057 0.257057 ZT20-23 0.3437915 0.3437915 0.3437915