condition mean min max ZT0-3 54.8 54.8 54.8 ZT4-7 49.7 49.7 49.7 ZT8-11 51.349999999999994 51.349999999999994 51.349999999999994 ZT12-15 37.25 37.25 37.25 ZT16-19 47.15 47.15 47.15 ZT20-23 47.0 47.0 47.0