condition mean min max ZT0-3 15.35 15.35 15.35 ZT4-7 11.8 11.8 11.8 ZT8-11 18.65 18.65 18.65 ZT12-15 45.3 45.3 45.3 ZT16-19 45.349999999999994 45.349999999999994 45.349999999999994 ZT20-23 37.25 37.25 37.25