Introducing an efficient sampling method for national surveys with limited sample sizes: application to a national study to determine quality and cost of healthcare

Table 3 Comparison of efficiency of clustering-based sampling to SRS based on distinct cluster features

Variables	Sampling efficiency \( \frac{{\mathbf{Variance}}_{\boldsymbol{SRS}}\left(\overline{\boldsymbol{X}}\right)}{{\mathbf{Variance}}_{\boldsymbol{Clustering}}\left(\overline{\boldsymbol{X}}\right)} \)
The ratio of sending referrals to receiving referrals (Patient exchange rate)	1.5
The probability of dying from Stroke (age ≥ 30)	1.7
The probability of dying from COPD^a (age ≥ 30)	1.5
The probability of dying from CKD^b (age ≥ 30)	1.4
The mortality rate attributed to the adverse effect of medical treatment	1.2
Expected mortality rate to observed mortality rate	1.3
The mortality rate among 1000 hospitalized patients	1.4

ISSN: 1471-2458