condition mean min max ZT0-3 35.6 35.6 35.6 ZT4-7 26.4 26.4 26.4 ZT8-11 48.349999999999994 48.349999999999994 48.349999999999994 ZT12-15 42.5 42.5 42.5 ZT16-19 59.9 59.9 59.9 ZT20-23 27.75 27.75 27.75