condition mean min max ZT0-3 71.75 71.75 71.75 ZT4-7 25.1 25.1 25.1 ZT8-11 51.3 51.3 51.3 ZT12-15 53.05 53.05 53.05 ZT16-19 35.05 35.05 35.05 ZT20-23 77.85 77.85 77.85