condition mean min max ZT0-3 56.05 56.05 56.05 ZT4-7 37.2 37.2 37.2 ZT8-11 58.7 58.7 58.7 ZT12-15 53.2 53.2 53.2 ZT16-19 60.45 60.45 60.45 ZT20-23 65.85 65.85 65.85