condition mean min max ZT0-3 49.75 49.75 49.75 ZT4-7 30.8 30.8 30.8 ZT8-11 28.1 28.1 28.1 ZT12-15 39.05 39.05 39.05 ZT16-19 45.849999999999994 45.849999999999994 45.849999999999994 ZT20-23 43.25 43.25 43.25