condition mean min max ZT0-3 24.5 24.5 24.5 ZT4-7 8.3 8.3 8.3 ZT8-11 60.95 60.95 60.95 ZT12-15 7.15 7.15 7.15 ZT16-19 28.799999999999997 28.799999999999997 28.799999999999997 ZT20-23 26.15 26.15 26.15