Table 3.
Studies characteristics
| Study country | Study type | Population size | Population age | Test used | |
|---|---|---|---|---|---|
| Anat Galor et al., 2011 | US | Case control | 16,862 patients (2056 cases) (14806 controls) | Not limited | ICD9 code |
| Adam J.paulsen et al., 2014 | US | Cohort | 3285 | 21-84 years | Questionnaire |
| Li Li tan et al., 2014 | Singapore | Cross sectional | 1004 | 15-83 years | McMonnie dry eye questionnaire |
| Ji Min Ahn et al., 2014 | Korea | Cross sectional | 11,666 | 19-95 | Survey and full ocular examination |
| Eloy Viso et al., 2009 | Spain | Cross sectional | 654 | +40 | Questionnaire, Schimer test, fluorescein |
| Miki Uchino et al., 2011 | Japan | Cross sectional | 3294 | +40 | Questionnaire |