condition mean min max ZT0-3 8017.913682 8017.913682 8017.913682 ZT4-7 8089.0093065 8089.0093065 8089.0093065 ZT8-11 7897.846729999999 7897.846729999999 7897.846729999999 ZT12-15 7806.838007 7806.838007 7806.838007 ZT16-19 7516.8000365 7516.8000365 7516.8000365 ZT20-23 6563.1622975 6563.1622975 6563.1622975