condition mean min max ZT0-3 13.804201415 12.54878609 15.05961674 ZT4-7 13.436697224499998 9.967615068999999 16.90577938 ZT8-11 21.9387534675 19.109397254999998 24.768109680000002 ZT12-15 44.8523234675 36.040038095 53.66460884 ZT16-19 48.945531779999996 47.76698226 50.1240813 ZT20-23 54.9792452425 54.555684135 55.402806350000006