condition mean min max ZT0-3 73.9 73.9 73.9 ZT4-7 63.9 63.9 63.9 ZT8-11 67.6 67.6 67.6 ZT12-15 53.4 53.4 53.4 ZT16-19 74.0 74.0 74.0 ZT20-23 77.6 77.6 77.6