condition mean min max ZT0-3 46.95 46.95 46.95 ZT4-7 54.4 54.4 54.4 ZT8-11 57.4 57.4 57.4 ZT12-15 64.0 64.0 64.0 ZT16-19 77.7 77.7 77.7 ZT20-23 103.9 103.9 103.9