Table 1 Checklist of methodological quality

 1

Positive if a clearly stated objective is described

 2

Positive if the main features of the study population are clearly described

 3

Positive if the inclusion and exclusion criteria are described

 4

Positive if a clear definition of retirement (timing) is given

 5

Positive if outcome source is register-based

 6

Positive if adjusted for other confounders/determinants from different scientific fields

 7

Positive if age (if possible), gender (if possible) and education are taken into account as confounders

 8

Positive if appropriate statistical model is used to evaluate data

 9

Positive if effect size of variables was presented or p-value 0.05 was shown or can be calculated