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In an attempt to estimate the growth rates and the association between baseline level and growth rate, LGC models were fitted.
This approach was taken to avoid the mathematical relationship between baseline level and change that applies if the spirometric variables are used as predictors of outcome.
The relation between baseline level and change was negative for all variables, indicating that most reduction occurs among those subjects displaying the highest baseline level, while lower baseline levels were associated with a less pronounced decrease and thus increased stability.
Because the methods described above assume independence between baseline blood pressure and the true change from baseline blood pressure, we also repeated the analyses using an approach based on mixed models, which do not assume independence between baseline level and the true change from baseline level.
We estimated that 10 patients per group would provide > 80% power to detect a difference of one standard deviation in cytokine levels, with a two-sided test for differences, a P-value of 0.01 whilst assuming an Intraclass Correlation of 0.2 between baseline level and Day 3. The intention to treat principle was utilised.
Similar(55)
Including age potentially could have changed the strength and direction of associations, as in the MetaPlus study we showed that age is a strong independent mortality predictor [7] and our present analysis demonstrates that including age group covariates markedly influences associations between baseline levels and 6-month mortality.
DAS sub-scales showed differences in parameter values for the prediction of depression, both the relation between baseline levels and the relation between changes in these two factors.
The other two alcohol variables showed similar results, with some minor differences regarding the decrease and co-variance between baseline levels and changes.
We also determined the relationship between baseline levels and changes in these markers and increases in bone mineral density (BMD) after initiation of infliximab therapy.
Comparisons between baseline levels and AUC across the three groups were performed with repeated-measures ANOVA because of the cross-over design of the study.
In this study, the improvement in BMD occurred despite no significant difference in serum 25(OH D levels between the two treatment groups at baseline, and no relationship between baseline levels and response to prescribed vitamin D was observed.
Related(20)
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