condition mean min max ZT0-3 1719.885903 1719.885903 1719.885903 ZT4-7 1474.977924 1474.977924 1474.977924 ZT8-11 1818.5648425 1818.5648425 1818.5648425 ZT12-15 1823.7847685000002 1823.7847685000002 1823.7847685000002 ZT16-19 1049.5876865 1049.5876865 1049.5876865 ZT20-23 1053.607429 1053.607429 1053.607429