Table 6.
Study sample size, overall and broken down by outcome type, intervention comparison type and medical area
| Studies | 25% | 50% | 75% | Max | ||
|---|---|---|---|---|---|---|
| All | Total | 112600 | 44 | 91 | 210 | 1242071 |
| Data type | Dichotomous | 77237 | 50 | 102 | 243 | 1242071 |
| Continuous | 29902 | 33 | 62 | 142 | 18851 | |
| Mixed | 5461 | 21 | 86 | 251 | 36511 | |
| Medical specialty | Cancer | 6441 | 72 | 154 | 326 | 266064 |
| Cardiovascular | 10686 | 44 | 102 | 289 | 67800 | |
| Central nervous system/musculoskeletal | 8299 | 43 | 80 | 149 | 9440 | |
| Digestive/endocr., nutritional and metabolic | 15345 | 42 | 79 | 160 | 18819 | |
| Gynaecology, pregnancy and birth | 20098 | 60 | 118 | 293 | 23697 | |
| Infectious diseases | 4502 | 59 | 130 | 371 | 419748 | |
| Mental health and behavioural conditions | 15218 | 36 | 63 | 165 | 9020 | |
| Pathological conditions, symptoms and signs | 4448 | 40 | 61 | 115 | 2463 | |
| Respiratory diseases | 13153 | 36 | 87 | 227 | 82892 | |
| Urogenital | 5914 | 39 | 71 | 153 | 4912 | |
| Other | 8496 | 44 | 90 | 198 | 1242071 | |
| Interventions | Pharm. vs. Control/Placebo | 44156 | 41 | 90 | 222 | 58050 |
| Pharm. vs. Pharm. | 28018 | 48 | 99 | 222 | 25180 | |
| Pharm. vs. Non-Pharm. | 2018 | 50 | 74 | 135 | 7711 | |
| Non-Pharm. vs. Control/Placebo | 20892 | 41 | 92 | 229 | 1242071 | |
| Non-Pharm. vs. Non-Pharm. | 17516 | 45 | 85 | 169 | 82892 | |
| Outcomes | Signs/symptoms reflecting continuation/end of condition | 17621 | 42 | 83 | 197 | 359600 |
| Adverse events | 11898 | 49 | 100 | 242 | 82892 | |
| Infection/onset of new acute/chronic disease | 11284 | 56 | 110 | 258 | 1242071 | |
| Biological markers | 10578 | 35 | 64 | 147 | 266064 | |
| General physical health | 8959 | 30 | 66 | 177 | 131271 | |
| Obstetric outcomes | 7376 | 60 | 117 | 293 | 18453 | |
| All-cause mortality | 8302 | 52 | 110 | 281 | 259627 | |
| Resource use/hospital stay/process | 5454 | 50 | 98 | 200 | 419748 | |
| Cause-specific mortality/major morbidity event/composite (mortality or morbidity) | 5413 | 69 | 165 | 449 | 266064 | |
| Other outcomes (semi-objective)1 | 10886 | 44 | 81 | 177 | 131271 | |
| Other outcomes (subjective)2 | 14490 | 38 | 71 | 162 | 359600 | |
1Other outcomes (semi-objective): External structure, Internal structure, Surgical/device related success/failure, Withdrawals/drop-outs
2Other outcomes (subjective): Pain, Mental health outcomes, Quality of life/functioning, Consumption, Satisfaction with care, Composite (at least 1 non-mortality/morbidity)