condition mean min max ZT0-3 63.75 63.75 63.75 ZT4-7 46.9 46.9 46.9 ZT8-11 27.049999999999997 27.049999999999997 27.049999999999997 ZT12-15 12.399999999999999 12.399999999999999 12.399999999999999 ZT16-19 68.6 68.6 68.6 ZT20-23 40.35 40.35 40.35