condition mean min max ZT0-3 47.6 47.6 47.6 ZT4-7 42.2 42.2 42.2 ZT8-11 36.8 36.8 36.8 ZT12-15 49.65 49.65 49.65 ZT16-19 73.7 73.7 73.7 ZT20-23 66.45 66.45 66.45