Table 3. Quantiles and moments of point prevalence per 1,000 persons.
| Methodological variables | Number of studies | Quantiles | Mean | Standard deviation | IQR | ||||
|---|---|---|---|---|---|---|---|---|---|
| 10% | 25% | Median | 75% | 90% | |||||
| 30 | 1.97 | 2.51 | 3.89 | 5.10 | 6.80 | 4.17 | 2.30 | 2.60 | |
| Case-finding method | |||||||||
| General population | 18 | 1.76 | 2.65 | 4.44 | 5.77 | 7.12 | 4.54 | 2.64 | 3.12 |
| Attended in any health service | 12 | 2.11 | 2.11 | 3.11 | 5.10 | 5.33 | 3.61 | 1.59 | 2.89 |
| Method of confirming diagnosis | |||||||||
| SCID | 3 | 4.73 | 5.50 | 6.80 | 7.30 | 7.60 | 6.27 | 1.86 | 1.80 |
| CIDI | 9 | 1.67 | 2.50 | 3.04 | 5.04 | 6.18 | 3.60 | 2.06 | 2.54 |
| SCAN | 2 | 5.01 | 5.02 | 5.05 | 5.08 | 5.09 | 5.05 | 0.07 | 0.05 |
| Clinical diagnosis | 9 | 2.10 | 3.54 | 4.70 | 5.38 | 11.70 | 4.57 | 3.03 | 2.98 |
| Others | 7 | 1.85 | 2.51 | 3.10 | 3.60 | 4.67 | 3.24 | 1.49 | 1.09 |
| International classification of diseases | |||||||||
| ICD | 14 | 2.32 | 2.84 | 3.60 | 4.97 | 5.74 | 3.84 | 1.683 | 2.12 |
| DSM | 15 | 1.30 | 3.11 | 5.00 | 6.65 | 11.70 | 4.84 | 2.84 | 3.59 |
| Both | 1 | 4.04 | 4.04 | 4.04 | 4.04 | 4.04 | 4.04 | - | 0.00 |
| Diagnosis category | |||||||||
| Schizophrenia only | 15 | 2.03 | 2.38 | 3.46 | 5.45 | 6.50 | 3.93 | 2.07 | 3.07 |
| Schizophrenia and related disorders | 6 | 1.61 | 2.01 | 2.63 | 4.53 | 5.18 | 3.14 | 1.69 | 2.52 |
| Non-affective psychosis | 6 | 2.80 | 3.34 | 4.54 | 6.38 | 9.29 | 5.54 | 3.40 | 3.05 |
| Probable schizophrenia | 3 | 4.02 | 4.42 | 5.10 | 5.10 | 5.10 | 4.65 | 0.78 | 0.68 |
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