condition mean min max ZT0-3 57.75 57.75 57.75 ZT4-7 77.3 77.3 77.3 ZT8-11 59.849999999999994 59.849999999999994 59.849999999999994 ZT12-15 60.7 60.7 60.7 ZT16-19 58.85 58.85 58.85 ZT20-23 46.25 46.25 46.25