condition mean min max ZT0-3 19.782282585 15.213390900000002 24.35117427 ZT4-7 11.51185052525 9.580434772 13.443266278500001 ZT8-11 16.517193015 12.6822687 20.35211733 ZT12-15 25.8146361375 23.39998911 28.229283165 ZT16-19 23.257806215 21.960193519999997 24.55541891 ZT20-23 18.3978520015 15.225930673 21.56977333