condition mean min max ZT0-3 20.558148 20.558148 20.558148 ZT4-7 11.2165315 11.2165315 11.2165315 ZT8-11 16.435839 16.435839 16.435839 ZT12-15 45.7123335 45.7123335 45.7123335 ZT16-19 24.9305595 24.9305595 24.9305595 ZT20-23 20.841391 20.841391 20.841391