condition mean min max ZT0-3 7.4131350000000005 7.4131350000000005 7.4131350000000005 ZT4-7 2.9118399999999998 2.9118399999999998 2.9118399999999998 ZT8-11 3.20642 3.20642 3.20642 ZT12-15 4.362845 4.362845 4.362845 ZT16-19 9.800585 9.800585 9.800585 ZT20-23 10.866775 10.866775 10.866775