condition mean min max ZT0-3 23.460002 23.460002 23.460002 ZT4-7 24.548209 24.548209 24.548209 ZT8-11 20.2331 20.2331 20.2331 ZT12-15 25.63787 25.63787 25.63787 ZT16-19 45.0970155 45.0970155 45.0970155 ZT20-23 59.1559375 59.1559375 59.1559375