condition mean min max ZT0-3 44.75 44.75 44.75 ZT4-7 37.9 37.9 37.9 ZT8-11 34.55 34.55 34.55 ZT12-15 12.899999999999999 12.899999999999999 12.899999999999999 ZT16-19 32.25 32.25 32.25 ZT20-23 37.349999999999994 37.349999999999994 37.349999999999994