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Cox proportional hazards models for the association between biomarkers of lead level and IHD, Normative Aging Study, 1991-2001 [HR (95% CI)]. The proportional hazards model was conducted with a backward likelihood ratio, and significance thresholds at entry and exit were set at 0. Survival analysis using Kaplan-Meier product-limit estimator and Cox proportional hazards models was employed to compute estimates for time-to-sputum conversion and rate ratios respectively. |
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