Skip to main content

Table 2 Methodological quality of cohort studies

From: The association between attention deficit/hyperactivity disorder and internet addiction: a systematic review and meta-analysis

Item

Chen, 2015

Ko, 2009

Representativeness of the exposed cohort

-

*

Selection of the non-exposed cohort

*

*

Ascertainment of exposure

*

*

Demonstration that outcome of interest was not present at start of study

-

-

Comparability of cohorts on the basis of the design or analysis

--

--

Assessment of outcome

*

*

Was follow-up long enough for outcomes to occur

*

*

Adequacy of follow up of cohorts

*

*

  1. A study could be awarded a maximum of one star for each item except for the item Comparability of cohorts on the basis of the design or analysis