condition mean min max ZT0-3 18.2 18.2 18.2 ZT4-7 30.7 30.7 30.7 ZT8-11 67.4 67.4 67.4 ZT12-15 63.0 63.0 63.0 ZT16-19 81.2 81.2 81.2 ZT20-23 55.0 55.0 55.0