condition mean min max ZT0-3 11.2555 11.0624 11.448599999999999 ZT4-7 18.8475 18.8475 18.8475 ZT8-11 14.39785 14.39785 14.39785 ZT12-15 0 0 0 ZT16-19 10.31457 10.31457 10.31457 ZT20-23 13.5789 13.5789 13.5789