condition mean min max ZT0-3 24.3 24.3 24.3 ZT4-7 28.0 28.0 28.0 ZT8-11 12.85 12.85 12.85 ZT12-15 26.799999999999997 26.799999999999997 26.799999999999997 ZT16-19 55.15 55.15 55.15 ZT20-23 18.0 18.0 18.0