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Table 1 Notation used for calculated parameters and outcome measures

From: Impact of case management by advanced practice nurses in primary care on unplanned hospital admissions: a controlled intervention study

n = denominator population patients aged 50 years and over
a = number of unplanned hospital medical or geriatric admissions
e = number of people ever admitted
r = number of people who admitted more than once
a/n = unplanned hospital admission per denominator population
e/n = proportion of denominator population ever admitted
(e-r)/n = single admitters as a proportion of the denominator population
(r/n) = multiple admitters as a proportion of the denominator population
(r/e) = multiple admissions per admitted patient
(a-e)/e = re-admissions per admitted patient
(a-e)/a = re-admissions as a proportion of all admissions
(a-e+r)/r = total admissions per multiple admitter
(a-e)/r = re-admissions per multiple admitter
(a-e-r)/r = 3rd and higher order admissions per multiple admitter