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Table 5 Multiple Linear Regression Analysis for Association Between Hemoglobin Level and Physical Component Summary Measure (log transformed) after Adjusting for Baseline Characteristics (Following variables were removed because of lack of significant association in bivariate analysis: pack years of smoking, history of myocardial infarction and renal diseases, and gender)

From: Association between anemia and quality of life in a population sample of individuals with chronic obstructive pulmonary disease

Variable* (n = 489) Regression Coefficient P Value R2
  Beta Std Error   
Hemoglobin 0.02 0.01 0.003 0.0850
Age -0.002 0.001 0.04  
Education 0.02 0.004 <0.0001  
Diabetes -0.07 0.03 0.02  
  1. *Race was eliminated in model selection