condition mean min max ZT0-3 78.6 78.6 78.6 ZT4-7 78.3 78.3 78.3 ZT8-11 73.25 73.25 73.25 ZT12-15 60.65 60.65 60.65 ZT16-19 66.55 66.55 66.55 ZT20-23 85.5 85.5 85.5