condition mean min max ZT0-3 565.254974 565.254974 565.254974 ZT4-7 790.3077989999999 790.3077989999999 790.3077989999999 ZT8-11 573.9271755 573.9271755 573.9271755 ZT12-15 601.3474415000001 601.3474415000001 601.3474415000001 ZT16-19 601.85735 601.85735 601.85735 ZT20-23 550.0577085 550.0577085 550.0577085