condition mean min max ZT0-3 30.65 30.65 30.65 ZT4-7 48.9 48.9 48.9 ZT8-11 26.85 26.85 26.85 ZT12-15 19.8 19.8 19.8 ZT16-19 15.15 15.15 15.15 ZT20-23 19.7 19.7 19.7