condition mean min max ZT0-3 22.1256 22.1256 22.1256 ZT4-7 19.27265 19.27265 19.27265 ZT8-11 26.89315 26.89315 26.89315 ZT12-15 31.08195 31.08195 31.08195 ZT16-19 26.618850000000002 26.618850000000002 26.618850000000002 ZT20-23 21.438699999999997 21.438699999999997 21.438699999999997