BACKGROUND: Japanese family physicians have limited psychiatric training, see a large volume of patients, and would benefit from the use of a mental-health screening tool. This study was an initial investigation into the feasibility and validity of using the Patient Health Questionnaire (PHQ) in the primary care setting in Japan.
METHODS: Feasibility was determined by surveying 149 patients from three primary care practices. Of this sample, a Japanese psychiatrist interviewed 98 participants to assess the validity of the PHQ. Based on the psychiatrist's results, sensitivity, specificity, positive predictive value, kappa statistic and the Likelihood Ratio were examined.
RESULTS: Some 83% of patients reported being “comfortable” in filling out the PHQ. Physicians (82%) reported that the information provided was “valuable” in understanding and treating the patient. The sensitivity of the PHQ in detecting any mental diagnosis was 93%, specificity was 81%, and the positive predictive value was 47%. In subjects with mood disorders, sensitivity was 75%, specificity was 88%, and the positive predictive value was 47%. The kappa reliability coefficients between the PHQ and psychiatrist diagnoses were 0.53 for any mental disorder and 0.51 for any mood disorder. In the case of any mental disorder, the Likelihood Ratio of a positive test (LR+) for the PHQ was 4.8. In the case of any mood disorder, the LR+ for the PHQ was 6.5.
CONCLUSIONS: The Japanese version of the PHQ was useful for detecting mental and mood disorders.

Introduction : To promote disease management in the community, general physicians should refer their patients to specialists in a timely and appropriate manner. In this study, we propose an indicator for evaluation of such referrals.
Methods : We analyzed all referrals in an urban clinic from September 1, 2011 to August 31, 2012. Symptoms and diagnoses documented by general physicians were collected from medical records, and the final diagnoses by specialists were collected from their reports. The symptoms and diagnoses were classified using the International Classification of Primary Care second edition (ICPC-2). Referral rates, hospitalization rates, and place of referral were analyzed.
Results : The average number of encounters in the candidate clinic was 1402 per month, and the mean number of referrals was 23 (1.6% of encounters). Of patients who received a referral, 6.75 (29.1%) were admitted to hospitals. The symptoms and diagnoses of the referred patients were distributed across all chapters (A to Z) of ICPC-2. Diagnoses of admitted patients included pneumonia (R81) (24%), urinary tract infection (U70 and U71) (9%), and acute gastroenteritis with dehydration (D73 with T11) (9%).
Conclusion : We identified the referral rates, hospitalization rates, and distribution of referral patients as indicators of the triage function of primary care physicians. These should be evaluated further as potential indicators of “the quality of medical care.”