Quality score of retrospective studies, individual items, and total score
| Items (weight)4-150 | van der Wal43 | Canivet29 | Lothe31 | St James-Roberts19 | Alvarez30 | Crowcroft42 | Thomas36 | Ståhlberg20 |
| Drop out—selection: % not included <20% (1) | + | + | + | ? | − | + | + | − |
| Diagnosis—definition sufficient (1) | + | + | + | + | + | − | − | − |
| Outcome (method) | ||||||||
| Amount of crying in ⩾3 categories or estimation of duration (1) | + | + | − | + | + | − | − | − |
| Yes/no answer to question whether child cries much (0) | − | − | + | − | − | + | + | + |
| Outcome (period of data collection) | ||||||||
| 0–4 months of age (2) | + | − | + | + | + | + | − | − |
| 4–6 months of age (1) | − | + | − | − | − | − | + | − |
| After 6 months of age (0) | − | − | − | − | − | − | − | + |
| Total quality score (0−5) | 5 | 4 | 4 | 4 | 4 | 3 | 2 | 0 |
↵4-150 Weight: score to compliance with item.
+ complied to item; − not complied to item; ? not stated.