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. 2016 Nov 8;13:40. doi: 10.3352/jeehp.2016.13.40

Table 2.

Risk of bias scoring

Article 1 2 3 4 5 6 7 8
Carr [13] (2009) b NA c a None b a d
Chew et al. [14] (2013) a NA c a None b a d
Doherty et al. [11] (2013) b NA c a None b a c
Humphrey-Murto et al. [12] (2014) b NA c a None b a d
Leddy et al. [15] (2011) b NA c a None c a d
Librrecht et al. [10] (2014) b NA c a a b a a

1: Representativeness of the exposed cohort; 2: Selection of the non-exposed cohort; 3: Ascertainment of exposure; 4: Demonstration that outcome of interest was not present at start of study; 5: Comparability of cohorts on the basis of the design or analysis; 6: Assessment of outcome; 7: Was follow-up long enough for outcomes to occur; 8: Adequacy of follow up of cohorts.

NA, not applicable.