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Table 1 Inclusion criteria

From: Correlation between patients’ reasons for encounters/health problems and population density in Japan: a systematic review of observational studies coded by the International Classification of Health Problems in Primary Care (ICHPPC) and the International Classification of Primary care (ICPC)

Study design Observational study
Date of publication Until March 31, 2015
Setting Japan
  Clinic only (Hospital were excluded)
Methods Coding RFEs or health problems using ICHPPC, ICHPPC-2,
  ICHPPC-2-Defined, ICPC and ICPC-2
Results Frequency of RFEs and health problems
  1. ICHPPC: International Classification of Health Problems in Primary Care
  2. ICPC: International Classification of Primary Care
  3. RFEs: reasons for encounters