condition mean min max ZT0-3 40.5978 29.53305 49.5665 ZT4-7 23.113500000000002 23.113500000000002 23.113500000000002 ZT8-11 31.99055 31.99055 31.99055 ZT12-15 47.71595 46.897149999999996 48.53475 ZT16-19 45.801249999999996 45.801249999999996 45.801249999999996 ZT20-23 54.90995 54.90995 54.90995