Table 2.
Newcastle-Ottawa scale (NOS) scores of the studies included in the meta-analysis.
| Author | Year | A | B | C | D | E | F | G | H | NOS Score |
|---|---|---|---|---|---|---|---|---|---|---|
| Moss | 2000 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 1 | 7 |
| Moutzouri | 2008 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 1 | 7 |
| Stegenga | 2010 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 8 |
| Schuetz | 2011 | 1 | 1 | 1 | 1 | 0 | 1 | 0 | 1 | 6 |
| Yang | 2011 | 1 | 1 | 1 | 1 | 0 | 1 | 0 | 1 | 6 |
| Schuetz | 2012 | 1 | 1 | 1 | 1 | 0 | 1 | 0 | 1 | 6 |
| Chang | 2012 | 1 | 1 | 1 | 1 | 0 | 1 | 0 | 1 | 6 |
| Al-Dorzi | 2012 | 1 | 1 | 1 | 1 | 0 | 1 | 0 | 1 | 6 |
| Venot | 2015 | 1 | 1 | 1 | 1 | 2 | 1 | 0 | 1 | 8 |
| De Miguel-Yanes | 2015 | 1 | 1 | 1 | 1 | 0 | 1 | 0 | 1 | 6 |
A – Representativeness of the exposed cohort; B – selection of the non-exposed cohort; C – ascertainment of exposure; D – demonstration that outcome of interest was not present at start of study; E – comparability of cohorts on the basis of the design or analysis; F – assessment of outcome; G – was follow-up long enough for outcomes to occur?; H – adequacy of follow-up of cohorts.