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Therefore the second control group (N = 20) was matched for age and sex distribution as well as for distribution of educational level.
Whereas RR are easy to interpret, comparisons of RR over time are complicated by possible changes over time in the distribution of educational level in the population, that is, that some groups may grow larger while others become more marginal.
This is especially noticeable as regards impaired mental health and reduced general health, where the Cretan IBS cases reported a lower HRQOL, even after adjustments for differences in the distribution of educational level and co-morbidity.
In order to also take into account distribution of educational level among the smokers, stratum specific total attributable fractions (sTAF) and overall total attributable fraction (TAF) were calculated [ 13].
There were few differences in the distribution of educational level or professional status across floors, however, the percentage of persons not in paid employment increased from 31.6 % on the ground floor to 46.3 % on the eighth floor and above.> -wrap-foot> Switzerlandnal Cohort, Switzerland 2000 As expected, the rent (in CHF per m) increased with the number of floors (Table 2).
After adjustments in multiple regressions for the differences in the distribution of educational level and occurrence of present or past co-morbidity (coronary heart disease, high blood pressure, rheumatoid arthritis and depression), the Cretan IBS cases nevertheless scored lower in general health (p = 0.05) and lower in mental health (p < 0.0001) than the age and sex-matched Swedish IBS cases.
Similar(54)
The forth limitation is that we were unable to recruit a patient sample with an even distribution of educational levels, probably because patients with higher education tend to prefer a private hospital to a teaching or public hospital.
The distribution of educational levels varies widely in the EPIC cohort (Table 1).
Whereas HRs are easy to interpret, comparisons of HRs across various groups of the population are complicated by different distributions of educational level across these subgroups.
The same can be concluded with respect to the distributions of educational levels in the sample and the population.
The report of educational level among our participants was within possible ranges, though the distribution would be different from other country context.
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