condition mean min max ZT0-3 48.75 48.75 48.75 ZT4-7 54.2 54.2 54.2 ZT8-11 26.099999999999998 26.099999999999998 26.099999999999998 ZT12-15 33.8 33.8 33.8 ZT16-19 38.349999999999994 38.349999999999994 38.349999999999994 ZT20-23 47.15 47.15 47.15