condition mean min max ZT0-3 65.0 65.0 65.0 ZT4-7 23.8 23.8 23.8 ZT8-11 67.4 67.4 67.4 ZT12-15 57.9 57.9 57.9 ZT16-19 35.45 35.45 35.45 ZT20-23 61.8 61.8 61.8