Table 4. Quantiles and moments of 12-month prevalence per 1,000 persons.
| Methodological variables | Number of studies | Quantiles | Mean | Standard deviation | IQR | ||||
|---|---|---|---|---|---|---|---|---|---|
| 10% | 25% | Median | 75% | 90% | |||||
| 37 | 2.03 | 3.20 | 4.03 | 4.97 | 7.79 | 4.69 | 3.24 | 1.77 | |
| Case-finding method | |||||||||
| General population | 19 | 2.05 | 3.43 | 4.40 | 6.04 | 8.76 | 5.57 | 4.15 | 2.61 |
| Attended in any health service | 18 | 1.95 | 3.25 | 3.70 | 4.20 | 5.01 | 3.75 | 1.45 | 0.96 |
| Method of confirming diagnosis | |||||||||
| SCID | - | - | - | - | - | - | - | - | - |
| CIDI | 13 | 2.00 | 2.77 | 4.94 | 7.05 | 10.47 | 5.92 | 4.95 | 4.27 |
| SCAN | 4 | 3.98 | 4.00 | 4.49 | 5.63 | 6.87 | 5.16 | 1.75 | 1.63 |
| Clinical diagnosis | 17 | 1.86 | 3.00 | 3.70 | 4.21 | 4.73 | 3.57 | 1.12 | 1.01 |
| Others | 3 | 3.51 | 3.00 | 3.75 | 5.84 | 7.09 | 5.04 | 2.50 | 2.24 |
| International classification of diseases | |||||||||
| ICD | 16 | 3.02 | 3.44 | 3496 | 5.00 | 7.95 | 5.23 | 4.22 | 1.57 |
| DSM | 18 | 1.97 | 2.36 | 4.21 | 5.00 | 7.31 | 4.32 | 2.45 | 2.63 |
| Both | 3 | 3.77 | 3.87 | 4.04 | 4.10 | 4.14 | 3.97 | 0.24 | 0.23 |
| Diagnosis category | |||||||||
| Schizophrenia only | 17 | 1.72 | 2.22 | 3.70 | 4.21 | 6.23 | 4.51 | 4.238 | 1.99 |
| Schizophrenia and related disorders | 4 | 3.19 | 3.69 | 4.27 | 4.67 | 4.85 | 4.09 | 0.91 | 0.98 |
| Non-affective psychosis | 14 | 2.88 | 3.42 | 4.49 | 6.55 | 8.05 | 5.12 | 2.52 | 3.13 |
| Probable schizophrenia | 2 | 3.87 | 4.05 | 4.35 | 4.65 | 4.83 | 4.35 | 0.85 | 0.60 |
IQR: Interquartile range. SCID: Structure Clinical Interview for DSM-IV, CIDI: Composite International Diagnostic Interview, SCAN: Schedules for Clinical Assessment in Neuropsychiatry.
ICD: International Classification of Diseases, DSM: Diagnostic and Statistic Manual of Mental Disorders