condition mean min max ZT0-3 1.2937 1.2937 1.2937 ZT4-7 0.989591 0.989591 0.989591 ZT8-11 0.3936295 0.3936295 0.3936295 ZT12-15 0.4037475 0.4037475 0.4037475 ZT16-19 0.981842 0.981842 0.981842 ZT20-23 0.968148 0.968148 0.968148