condition mean min max ZT0-3 20.600126 20.600126 20.600126 ZT4-7 25.1811605 25.1811605 25.1811605 ZT8-11 29.0756515 29.0756515 29.0756515 ZT12-15 37.934689500000005 37.934689500000005 37.934689500000005 ZT16-19 43.5647985 43.5647985 43.5647985 ZT20-23 39.391364 39.391364 39.391364