condition mean min max ZT0-3 1.898155 1.898155 1.898155 ZT4-7 1.590545 1.590545 1.590545 ZT8-11 1.943365 1.943365 1.943365 ZT12-15 1.960305 1.960305 1.960305 ZT16-19 2.051745 2.051745 2.051745 ZT20-23 1.94219 1.94219 1.94219