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Table 4 Characteristics of included studies

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)

  Total number (proportion %)
Eligible publications 17
Classification  
 ICHPPC 1 (5.9)
 ICHPPC-2-Defined 9 (52.9)
 ICPC 5 (29.4)
 ICPC-2 2 (11.8)
Study period  
  < 1 year 4 (23.5)
 1 year 10 (58.8)
  > 1 year 2 (11.7)
 Others: one study contained two study periods (2 years and 4 month) 1 (5.9)
Setting  
 Urban clinic 1 (5.9)
 Rural clinic 13 (76.5)
 Comparison between 1 (76.5)
 rural clinic, rural hospital and urban clinic 1 (5.9)
 University hospital’s affiliated primary care clinic 1 (5.9)
Number of facilities  
 Single 12 (70.6)
 Multiple 5 (29.4)
Study design  
 Prospective 13 (76.5)
 Retrospective 2 (15.4)
 Prospective and retrospective 1 (5.9)
 No description about study design 1 (5.9)
Number of evaluators  
 1 person 11 (64.7)
  ≥ 2 persons 3 (17.6)
 No description about number of evaluators 3 (17.6)
Quality of coding  
 There are descriptions about quality of coding 2 (11.8)
 There are no descriptions about quality of coding 15 (88.2)
Primary outcome measure  
 Only RFEs 1 (5.9)
 Only health problems 9 (52.9)
 RFEs and health problems 7 (41.2)
  1. ICHPPC: International Classification of Health Problems in Primary Care
  2. ICPC: International Classification of Primary Care
  3. RFEs: reasons for encounter