Table 2 Quality assessment
| Â | Description of randomisation procedure | Pre- stratification | Concealment of random allocation | Description of loss to follow-up | Blinding of patients | Blinding of treatment providers | Description of co- interventions | Blinding of outcome assessors | Intention-to-treat-analysis | Adjustment for imbalances |
|---|---|---|---|---|---|---|---|---|---|---|
Elmes 1957 [28] | 1 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 |
Berry 1960 [27] | 1 | 0 | 1 | 0 | 1 | 1 | 1 | 1 | 1 | 0 |
Fear 1962 [29] | 1 | 0 | 1 | 1 | 1 | 1 | 0 | 1 | 1 | 0 |
Petersen 1967 [35] | 1 | 1 | 0 | 1 | 1 | 0 | 0 | 0 | 0 | 1 |
Pines 1968 [37] | 1 | 0 | 1 | 1 | 1 | 1 | 0 | 1 | 1 | 0 |
Pines 1972 [36] | 1 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 |
Anthonisen 1987 [26] | 1 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 0 |
Allegra 1991 [25] | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 0 | 0 |
Alonso Martinez 1992 [32] | 1 | 0 | 1 | 1 | 1 | 1 | 1 | 0 | 1 | 0 |
Jorgensen 1992 [30] | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
Sachs 1995 [31] | 1 | 0 | 1 | 1 | 1 | 1 | 1 | 0 | 1 | 0 |
Nouira 2001 [34] | 1 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 |