condition mean min max ZT0-3 0.7665615 0.3797775 0.9799835000000001 ZT4-7 0.739054 0.739054 0.739054 ZT8-11 2.25041 2.25041 2.25041 ZT12-15 1.7105424999999999 1.6937449999999998 1.7273399999999999 ZT16-19 0.9538685 0.9538685 0.9538685 ZT20-23 0.741467 0.741467 0.741467