condition mean min max ZT0-3 12.95 12.95 12.95 ZT4-7 18.2 18.2 18.2 ZT8-11 57.099999999999994 57.099999999999994 57.099999999999994 ZT12-15 17.85 17.85 17.85 ZT16-19 18.35 18.35 18.35 ZT20-23 12.649999999999999 12.649999999999999 12.649999999999999