Aristolochia serpentaria (Virginia snakeroot), Aristolochia reticulata (Texas snakeroot) and in Chinese herbs such as Aristolochia fangchi and Aristolochia mandshurensis (banned in China and withdrawn from Chinese Pharmacopoea 2005; Stephania tetrandra and Magnolia officinalis do not contain aristolochic acid).
age-based rationing. Age-Based Rationing. A proposed form of rationing publicly-funded health care services, in which limits would be placed on the type and amount of such services that would be freely available to persons above a certain age.
When we artificially made the age distributions the same, it removed the imbalance and allowed us to look at the difference between the two states independent of the effect of age. Note also that the standardized rate ratio (SRR) is 1,069/1,014 = 1.05, i.e., substantially less than the crude rate ratio of 2.68.