8 This scheme requires details of the type of job done; whether self employed or employed, and, if relevant, managerial status; and the size of the employing organisation.
Judged by the confidence intervals, the differences between self-employed and employed doctors were statistically significant on all three levels.
Moreover, the differences we found between self-employed and employed persons may be caused by the use of different study methods in the literature for the two groups.
Six week PNC attendance was not statistically different among un-employed and employed women (adjusted OR 0.72: p = 0.16), but un-employment of a husband was associated with lower PNC attendance compared to employed husbands (un-adjusted OR 0.32: p = 0.008).
People are included independent of their working status, so that the analysis includes full and part time employed, occasionally employed, unemployed and people who are still enrolled in school17.
Labour market activity was defined as employed, not employed but seeking work, or not employed and not seeking work at the Wave 3 interview date.
We compared electricians to three reference groups (general population, construction industry and carpenters/brick layers) and utilized analytical methods for minimizing HWE bias (lag time analyses, age-stratified analyses, marginal structural model and restriction to employed, newly employed or long-term workers).
Because the estimates in columns 2 and 4 are replications of Carpenter (2006) using only data from the First Circuit, the dependent variable employed counts respondents who are employed for wages as employed and counts all others as unemployed (but drops the self-employed).
