condition mean min max ZT0-3 50.75 50.75 50.75 ZT4-7 58.9 58.9 58.9 ZT8-11 44.65 44.65 44.65 ZT12-15 53.75 53.75 53.75 ZT16-19 30.1 30.1 30.1 ZT20-23 56.85 56.85 56.85