Table 3.
The modified Newcastle–Ottawa scale for case-control studies.
| Selection (1) |
Selection (2) |
Selection (3) |
Selection (4) |
Comparability (1) |
Outcome (1) |
Outcome (2) |
Score | Quality | |
|---|---|---|---|---|---|---|---|---|---|
| Streckfus et al. 1994b [24] | * | - | - | * | * | ** | * | 6/10 | Fair |
| Nonzee et al. 2012 [25] | * | - | - | - | * | ** | * | 5/10 | Poor |
| Muñoz et al. 2012 [21] | * | - | - | - | * | * | * | 4/10 | Poor |
| De la luz et al. 2013 [17] | - | - | - | - | * | ** | * | 4/10 | Poor |
| Kagawa et al. 2013 [26] | * | - | - | * | * | ** | * | 6/10 | Fair |
| Prasanthi et al. 2014 [11] | * | - | - | - | * | * | * | 4/10 | Poor |
| Ivanovski et al 2015 [22] | * | - | - | * | * | ** | * | 6/10 | Fair |
| Nimma et al. 2016 [23] | - | - | - | * | * | * | * | 4/10 | Poor |
* p < 0.001; ** p ≤ 0.05.