condition mean min max ZT0-3 91.6 91.6 91.6 ZT4-7 30.1 30.1 30.1 ZT8-11 94.3 94.3 94.3 ZT12-15 86.7 86.7 86.7 ZT16-19 76.35 76.35 76.35 ZT20-23 78.05 78.05 78.05