condition mean min max ZT0-3 29.8436045375 28.33200868 31.355200395 ZT4-7 23.3891844525 22.855960485 23.92240842 ZT8-11 31.273196345 25.438185345 37.108207345 ZT12-15 38.492193605000004 37.273377995000004 39.711009215000004 ZT16-19 37.846490392499994 35.920554679999995 39.772426104999994 ZT20-23 38.42143361 37.471455965000004 39.371411255