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Table 4 Completeness of personal identifiers available for record linkage

From: Record linkage under suboptimal conditions for data-intensive evaluation of primary care in Rio de Janeiro, Brazil

Database Social Benefits National Registry (Cadastro Único—CadU) Family Health Registry (Sistema de Cadastro da Estratégia de Saúde da Família—FHR) Eletronic Medical Registry (Prontuário Eletrônico de Pacientes—EMR) National Hospital Admission System (Sistema de Informações Hospitalares—SIH) National Mortality Information System (Sistema de Informações sobre Mortalidade—SIM)a
N = 1,680,700 N = 3,732,688 N = 17,764,475 N = 1,787,601 N = 2,263,964
Identifiers % % % % %
Name 100 100 99.2 96.6 99.8
Mother’s name 99.6 100 (–) 90.2 96.6
Date of birth 100 100 100 100 97.2
Sex 100 100 100 100 100
Address 82.3 98.8 80.0 98.6 88.6
Social security number 56.5 82.7 84.0 (–) (–)
NIS 99.6 7.3 7.3 (–) (–)
  1. Social security number (Cadastro de Pessoa Física—CPF)
  2. National register for social benefit (Número de Inscrição Social—NIS)
  3. (–) Attribute not available in the database
  4. aExcluding fetal deaths and deaths of children under 1-year-old