condition mean min max ZT0-3 41.0 41.0 41.0 ZT4-7 28.3 28.3 28.3 ZT8-11 37.95 37.95 37.95 ZT12-15 41.95 41.95 41.95 ZT16-19 47.849999999999994 47.849999999999994 47.849999999999994 ZT20-23 56.35 56.35 56.35