condition mean min max ZT0-3 56.95 56.95 56.95 ZT4-7 71.0 71.0 71.0 ZT8-11 47.3 47.3 47.3 ZT12-15 63.849999999999994 63.849999999999994 63.849999999999994 ZT16-19 78.65 78.65 78.65 ZT20-23 77.75 77.75 77.75