Table 2. Quality assessment of the 5 studies included in the meta-analysis according to the Newcastle-Ottawa Scale.
| Study | Selection | Comparability | Outcome | Total Score |
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|---|---|---|---|---|---|---|---|---|---|
|
|
|
|
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| Exposed Cohort Representative |
Selection of Non-Exposed Cohort |
Ascertainment of Exposure |
Outcome not Present at Baseline |
Analysis Adjusted for Confounding Factors |
Assessment of Outcome |
Length of Follow-up |
Adequacy of Follow-up |
||
| Jain (1995)10 | 0 | 1 | 1 | 1 | 0.5 | 1 | 1 | 0 | 5.5 |
| Jiang (1996)11 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 7 |
| Krantz (1999)12 | 0 | 1 | 1 | 1 | 0.5 | 1 | 1 | 1 | 6.5 |
| Sheps (2002)13 | 0 | 1 | 1 | 1 | 0.5 | 1 | 1 | 1 | 6.5 |
| Babyak (2010)14 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 7 |
| Mean score | 0 | 1 | 1 | 1 | 0.7 | 1 | 1 | 0.8 | 6.5 |