Table 2 Baseline covariates
From: An exploration of the missing data mechanism in an Internet based smoking cessation trial
Covariate | Parameter | Type | Smoking related? | Description | Summary statistics |
|---|---|---|---|---|---|
Treatment | β 1,1 | Binary | No | Indicator for treatment group | 877/1758 treated |
Age | β 1,2 | Continuous | No | Age in years | 38 (11) |
Sex | β 1,3 | Binary | No | Indicator for a female participant | 1126/1758 female |
Qualifications | β 1,4 | Categorical | No | Educational qualifications: 1=None; 2=GCSE | 3.06 (1.16) |
3=A-level; 4=Undergraduate Degree; 5=Postgraduate Degree | |||||
Deprivation | β 1,5 | Categorical | No | Deprivation score, range 0-5, higher indicates more deprived | 1.21 (1.09) |
Conscientiousness | β 1,6 | Continuous | No | Conscientiousness score, range 1-5, higher | 3.31 (0.84) |
indicates more conscientiousness (takes values between 1-5, in steps of 0.25, and so is not truly continuous). | |||||
Determination | β 1,7 | Categorical | Yes | Determination to quit: 1=not at all; 5=extremely | 4.30 (0.75) |
Support | β 1,8 | Categorical | Yes | Does the participant feel supported by family and friends: 1=not at all; 5=extremely | 3.31 (1.23) |
Dependence | β 1,9 | Categorical | Yes | Cigarette dependence score, range 1-8, | 5.48 (1.57) |
higher indicates greater dependence | |||||
Previous | β 1,10 | Binary | Yes | Indicator for not having managed to quit previously | 907/1758 have |