<qa>  What is the ratio of deficits present to the total number of deficits considered?Deficit accumulation model: This hypothesis assumes that frailty occurs due to accumulation and additive effect of multiple deficits, which occur across various domains. The more deficits a person has, the more likely that person is to be frail. Frailty in this paradigm is thus measured by identifying the number of positive factors deficits from a list. This is used to create a proportional index of deficits, expressed as the ratio of deficits present to the total number of deficits considered. 