condition mean min max ZT0-3 46.5 46.5 46.5 ZT4-7 37.8 37.8 37.8 ZT8-11 53.349999999999994 53.349999999999994 53.349999999999994 ZT12-15 42.3 42.3 42.3 ZT16-19 49.25 49.25 49.25 ZT20-23 35.3 35.3 35.3