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Table 1 Simulation model parameters, source of information and distribution function.

From: Geographical variations in the benefit of applying a prioritization system for cataract surgery in different regions of Spain

Parameter Source Distribution
Related to initial state   
   Non Expressed Need 1st Surgery Backlog North London Eye Study Fixed value
   Non Expressed Need 2nd Surgery Backlog North London Eye Study Fixed value
   Waiting List Backlog Waiting list register Fixed value
   Proportion of patients waiting for 2nd eye surgery Pilot Study (Empirical) Fixed value
Static parameters   
   Incident cases per month North London Eye Study Poisson*
   Number of operations in the private sector per month Hospital Discharge Minimum Data Set Poisson*
   Proportion of cases of the waiting list who switch to the private sector Pilot Study (Empirical) Bernoulli
   Top limit for waiting list contents (self-regulation) Opportunistic Fixed value
   Increase in priority score Pilot Study (Empirical) Fixed value
   Time between revisions of priority score Pilot Study (Empirical) Fixed value
   Mortality Spanish Mortality Register Empirical lifetime density function
Dynamic parameters   
   Number of surgeries per month Hospital Discharge Minimum Data Set Poisson*
   Probability of second eye surgery Hospital Discharge Minimum Data Set Bernoulli
   Number of bilateral cases entering the waiting list per month Waiting list register Poisson*
  1. *Poisson distributions were generated as time between arrivals of the events through an Exponential distribution