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Table 2 quality evaluation of included studies

From: Can internal mammary lymph nodes irradiation bring survival benefits for breast cancer patients? A systematic review and meta-analysis of 12,705 patients in 12 studies

References

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

Score

Wang [13]

*

*

*

*

**

*

*

8

Luo [14]

*

*

*

*

**

*

*

8

Thorsen [15]

*

*

*

*

*

*

6

Kim [16]

*

*

*

*

**

*

*

8

Yadav [17]

*

*

*

*

*

*

*

7

Aleknavičius [18]

*

*

*

*

*

*

6

Courdi [19]

*

*

*

*

*

5

Chang [20]

*

*

*

*

*

*

*

7

Hennequin [21]

*

*

*

*

*

*

*

7

Olson [22]

*

*

*

*

*

*

*

7

Stemmer [23]

*

*

*

*

*

*

*

*

8

Obedian [24]

*

*

*

*

*

*

*

7

  1. “*” means yes; “–” means no