condition mean min max ZT0-3 66.578966 66.578966 66.578966 ZT4-7 209.6551335 209.6551335 209.6551335 ZT8-11 167.7713705 167.7713705 167.7713705 ZT12-15 94.9459145 94.9459145 94.9459145 ZT16-19 81.7872835 81.7872835 81.7872835 ZT20-23 76.123726 76.123726 76.123726