http://64188.org/story.php?title=test-for-trends-the-cox-proportional-hazards-regression-model-was-used-1 Test for trends. The Cox proportional hazards regression model was used to control for multiple factors simultaneously and to estimate adjusted hazard ratios (HRs) and 95 confidence intervals. The relative increase in the risk of breast cancer recurrence for each of the three higher quartiles was estimated in comparison to that for the lowest quartile; it was also used to test for a linear trend Sat, 18 Feb 2023 04:07:50 UTC en