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Table 1 Characteristics of Subjects With and Without History of Childhood Pneumonia

From: Childhood pneumonia increases risk for chronic obstructive pulmonary disease: the COPDGene study

  Childhood Pneumonia No Childhood Pneumonia p Valueb
  N = 854 (8.4 %) N = 9302 (91.6 %)  
DEMOGRAPHIC
 Male gender (%) 437 (51.2 %) 4990 (53.6 %) 0.18
 Mean age, years (SD) 61.7 (8.9) 59.4 (9.0) <0.001c
 Non-Hispanic white (%) 693 (81.1 %) 6073 (65.3 %) <0.001
SMOKE EXPOSURE
 In-utero smoke exposure (%)a 206 (33.0 %) 2082 (30.2 %) 0.18
 Lived with smoker in childhood (%)a 732 (85.7 %) 7618 (81.9 %) 0.006
 Mean age started smoking, years (SD) 16.5 (4.4) 16.9 (4.7) 0.06
 Pack-years of smoking (SD) 49.8 (28.4) 43.7 (24.6) <0.001
 Current smoking (%) 379 (44.4 %) 5011 (53.9 %) <0.001
PNEUMONIA HISTORY
 Ever had pneumonia (%) 854 (100.0 %) 2979 (33.9 %) <0.001
 Diagnosed with pneumonia by healthcare provider (%)a 821 (96.1 %) 2920 (31.4 %) <0.001
 Pneumonia childhood age unknown (%) 378 (44.3 %) 0 (0.0 %) <0.001
 Age first pneumonia in years, mean (SD)a 7.7 (4.5) 42.5 (15.6) <0.001
 Lifetime pneumonia episodes (SD)a 3.9 (4.9) 2.5 (3.0) <0.001
  1. Abbreviations: SD standard deviation
  2. aSubjects included are fewer than total subjects due to subject survey response being missing or unclassifiable
  3. bUnivariate analysis with chi-square or Wilcoxon rank sum test unless otherwise specifiedc t test