All energy-adjusted Spearman's correlation coefficients were lower than crude coefficients in terms of ICCs in FFQ1 and FFQ2.
Although all energy-adjusted Spearman's correlation coefficients were lower than the crude coefficients, de-attenuation to correct for intra-individual variability improved the correlation coefficients.
All crude coefficients, whether those of FFQ1 and the 24-HRs or FFQ2 and the 24-HRs, were greater than 0.4, indicating good correlation.
In the first stage, crude coefficients, odds ratios (OR) of the impact of odd variables on the successful smoking cessation in males and females, were calculated.
After univariate regression analysis, treatments not following the "when-to-start" guidelines were associated with decreased CD4 counts (crude Regression Coefficient [cRC] = -39.5, 95% CI -66.4; -12.6, P = .004), but was not associated with treatment modification (crude odds ratio [OR] = 0.95, 95% CI 0.67-1.33, P = .75) or HIV-RNA <50 copies/mL at 12 months (cOR = 1.12, 95% CI 0.78-1.60, P = .54).54
The table also shows unadjusted (crude) regression coefficients.
Crude correlation coefficients between differences in 5-year prevalence, incidence, and 5-year survival provided very similar results (Web Appendix 3).
Variables that changed the crude regression coefficients by > 10% were considered confounders [age, body mass index (BMI), occupation, smoking, and alcohol intake].
In contrast, the longer gap between the first and second personal monitoring (mean, 19 weeks; range, 17 23 weeks) yields lower crude correlation coefficients for the nine PAHs.
