condition mean min max ZT0-3 8.500029999999999 8.500029999999999 8.500029999999999 ZT4-7 8.275765 8.275765 8.275765 ZT8-11 6.76205 6.76205 6.76205 ZT12-15 7.50481 7.50481 7.50481 ZT16-19 9.547654999999999 9.547654999999999 9.547654999999999 ZT20-23 8.361474999999999 8.361474999999999 8.361474999999999