condition mean min max ZT0-3 15.0 15.0 15.0 ZT4-7 53.7 53.7 53.7 ZT8-11 69.0 69.0 69.0 ZT12-15 75.45 75.45 75.45 ZT16-19 42.85 42.85 42.85 ZT20-23 35.65 35.65 35.65