Table 2.
Characteristics of included studies
| Study ID | Country | Design | Number (P/L)a | Average age | Separators |
|---|---|---|---|---|---|
| Celestino No´brega 2013 | Brazil | RCT | 60 (30/30) | 17.5 | 3 M Unitek |
| Won Tae Kim 2012 | Korea | RCT | 58 (30/28) | 21.52 | Dentalastics Separators, Dentaurum,Ispringen, Germany,2.1 mm |
| Ladan Eslamian 2013 | Iran | CCT (split mouth design) | 37 (37/37) | 24.97 | Dentarum, Springen, Germany |
| Esper MA 2011 | Brazil | RCT | 38 (38/12) | 23.4 | Morelli, 4.0 mm, Ø 5/32" |
| Ida Marini 2013 | Italy | RCT | 80 (40/40) | 23.0875 | NRb |
| Zhang HY 2014 | China | RCT | 60 (30/30) | 15.9 | NR |
a:P = placebo group; L = LLLT group
b:NR = not report