Table 2 Quality assessment of included studies based on an adapted version of the Newcastle-Ottawa scale
From: A systematic review of PTSD to the experience of psychosis: prevalence and associated factors
Quality domain | Quality criteria | Abdelghaffar et al. (2018) [25] | Bendall et al. (2012) [26] | Berry et al. (2015) [27] | Picken & Tarrier (2011) [24] | Pietruch & Jobson (2012) [23] | Turner et al. (2013) [28] | |
|---|---|---|---|---|---|---|---|---|
1. | Representativeness of sample | Truly representative (2) | 1 | 1 | 1 | 0 | 1 | 1 |
Somewhat representative (1) | ||||||||
No description of derivation of sample (0) | ||||||||
2. | Ascertainment of exposure | Patient notes (2) | 2 | 2 | 2 | 2a | 0 | 2 |
Clinical interview (2) | ||||||||
Self-report (1) | ||||||||
No description (0) | ||||||||
3. | Same method of ascertainment for entire sample | Yes (2) | 2 | 2 | 2 | 2 | 0 | 2 |
No (0) | ||||||||
4. | Non-participation rate | High rate, described (2) | 0 | 2 | 0 | 0 | 0 | 0 |
Low rate, described (2) | ||||||||
All participants asked took part (2) | ||||||||
Non-participants not described (0) | ||||||||
5. | Assessment of outcome | Questionnaire (2) | 2 | 2 | 2 | 2 | 2 | 2 |
Clinical interview (2) | ||||||||
Self-report or patient notes (1) | ||||||||
No description (0) | ||||||||
6. | Confounders | Confounders described and adjusted for (2) | 1 | 1 | 0 | 1 | 1 | 0 |
Confounders described (1) | ||||||||
No description (0) | ||||||||
TOTAL | 7 Medium | 8 Medium | 6 Medium | 6 Medium | 4 Low | 6 Medium |