condition mean min max ZT0-3 67.1 67.1 67.1 ZT4-7 8.7 8.7 8.7 ZT8-11 40.3 40.3 40.3 ZT12-15 51.8 51.8 51.8 ZT16-19 55.75 55.75 55.75 ZT20-23 80.5 80.5 80.5