Table 1 Summary of cohort studies included in the review

Publication year

2000

2

(2)

2001

4

(5)

2002

4

(5)

2003

5

(6)

2004

6

(7)

2005

8

(10)

2006

11

(13)

2007

13

(16)

2008

13

(16)

2009

16

(20)

Number of participants recruited at baseline

Not stated in paper

4

(5)

1,000–2,000

15

(18)

2,000–3,000

13

(16)

3,000–5,000

14

(17)

5,000–10,000

13

(16)

10,000–20,000

14

(17)

20,000 +

9

(11)

Date of baseline recruitment (decade recruitment started)

Not stated in paper

5

(6)

Before 1970

9

(11)

1970–1979

9

(11)

1980–1989

25

(30)

1990–1999

30

(37)

2000–2009

4

(5)

Number of follow-up waves used in the analysis

Number not stated

12

(15)

Mean or range given

7

(9)

1

10

(12)

2

9

(11)

3

18

(22)

4

12

(15)

≥5

14

(17)

Statistical methods for epidemiological analysis†

Cox proportional hazards regression^

37‡

  Time-varying covariates

35

  Time-invariant covariates

3

Generalised Estimating Equations

12*

  Linear regression

3

  Logistic regression

10

Generalised linear mixed-effects modelling

16

  Linear regression

13

  Logistic regression

3

Standard linear regression

3

Standard logistic regression

9

Other methods

6