condition mean min max ZT0-3 1640.843044 1640.843044 1640.843044 ZT4-7 1867.6546755 1867.6546755 1867.6546755 ZT8-11 984.9419845 984.9419845 984.9419845 ZT12-15 752.050888 752.050888 752.050888 ZT16-19 570.1720789999999 570.1720789999999 570.1720789999999 ZT20-23 650.542301 650.542301 650.542301