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

From: Participant demographics reported in "Table 1" of randomised controlled trials: a case of "inverse evidence"?

Demographic variable Percentage of papers reporting that variable
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