Effects of years of Great Lakes sport fish and sport fish consumption were modeled using time-dependent Cox proportional hazards regression and effects of POP exposures on UL were modeled using multiple logistic regression.
This event dependence may be acquired or defined by biological characteristics and may be modeled using time-dependent covariates.
Exposure to long-term air pollution was modeled using time-dependent variables of time-weighted average NOx, NO2, and NO concentrations at each year of age during follow-up (one row of data for each year of age that a participant contributed to follow-up).
We then performed mixed-effects regression modeling using time as a continuous variable and assumed randomly varying intercepts and slopes for each participant to determine the average change in AER over time.
31 We used Cox proportional hazards modelling using time varying variables with the most updated information for PPI use and other covariates before each two year interval to calculate adjusted hazard ratios and 95% confidence intervals.
Cox proportional hazards modelling using time-dependent covariates was used to measure the independent relationship between prolonged postoperative morbidity and longer term survival.
We used Cox proportional hazards modeling, using time-varying variables with the most updated information for periodontal disease and other covariates before each 2-year interval, to compute hazard ratios (HRs) and 95% confidence intervals (CIs).
