condition mean min max ZT0-3 9.18 9.18 9.18 ZT4-7 18.399999999000002 18.399999999000002 18.399999999000002 ZT8-11 40.54722222 40.54722222 40.54722222 ZT12-15 25.87444444333333 25.87444444333333 25.87444444333333 ZT16-19 17.36777778 17.36777778 17.36777778 ZT20-23 11.06222222 11.06222222 11.06222222