condition mean min max ZT0-3 30.799999999999997 30.799999999999997 30.799999999999997 ZT4-7 62.9 62.9 62.9 ZT8-11 11.0 11.0 11.0 ZT12-15 47.65 47.65 47.65 ZT16-19 22.55 22.55 22.55 ZT20-23 25.95 25.95 25.95