Table 2 Critical appraisal of the longitudinal cohort and case-control studies included for analysis

Cohorts

Barnett and Brennan (1998)[40]

**

***

**

**

**

5;6

Bromet et al. (1988)[39]

**

**

**

**

***

4;7

Fuhrer et al. (1999)[131]

***

***

*

**

*

6;4

Griffin et al. (2002)[37]

**

**

**

**

*

4;5

Marchand et al. (2005)[12]

***

***

***

**

**

6;7

Niedhammer et al. (1998)[38]

**

**

*

**

*

4;4

Revicki et al. (1993)[129]

*

*

*

**

*

2;4

Shields (1999)[132]

**

**

***

**

**

4;7

Shields (2002) [130]

**

***

**

**

**

5;6

Smith et al. (2008)[133]

***

**

**

**

**

5;6

Stansfeld et al. (1998)[134]

***

***

*

**

**

6;5

Wickrama et al. (2007)[36]

**

*

*

*

**

3;4

Case-control

Ostry et al. (2006)[35]

*

*

**

**

**

2;6