Table 1 Reporting of demographic variables in 100 RCTs published in four leading general medicine journals

Age

99

Sex

99

Weight/BMI

39

Ethnicity

37

Smoking

24

Educational attainment

23

Marital Status

13

Any area-based measure (eg index of deprivation or disadvantage, rurality distance from health centres etc)

10

Employment status

10

Alcohol

4

Occupational status

2

Income

2

Language spoken

0