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Table 2 Characteristics of the participants at year 0 according to baseline BMI quartiles, the CARDIA study, 1985–96

From: Longitudinal association of body mass index with lung function: The CARDIA Study

  Quartiles of Baseline BMI
  Q1 <21.3 kg/m 2 Q2 21.3–<23.4 kg/m 2 Q3 23.4–<26.4 kg/m 2 Q4 ≥ 26.4 kg/m 2
  (n = 1117) (n = 1191) (n = 1215) (n = 1211)
Age (Years) 24.3 (3.7) 24.7 (3.5) 25.1 (3.6) 25.3 (3.5)
FVC (L) 4.02 (0.88) 4.40 (0.96) 4.58 (1.06) 4.19 (1.05)
FEV 1 (L) 3.38 (0.68) 3.64 (0.75) 3.74 (0.82) 3.44 (0.82)
FEV 1 /FVC 85 (7) 83 (6) 82 (6) 83 (6)
Physical activity (exercise units) 395 (275) 462 (299) 459 (317) 375 (290)
Alcohol (mg/day) 10.6 (19.0) 12.9 (22.8) 13.5 (21.0) 11.4 (22.4)
Education (% ≤ high school) 39.8 37.6 35.6 42.6
Race (Blacks) (%) 44.1 45.1 48.8 64.4
Sex (Male) (%) 32.6 51.2 57.5 43.0
Prevalence of asthma at year 0 (%) 9.0 9.2 10.9 10.2
Cumulative incidence of asthma during 10 years of follow-up (%) 6.8 4.9 5.4 8.1
Prevalence of ex-smokers (%) 14.2 13.0 15.1 12.1
Prevalence of current smoking ≤ 15 cigs/day (%) 21.7 21.6 19.1 20.9
Prevalence of current smoking > 15 cigs/day (%) 9.9 9.9 10.0 9.8
  1. * Variables were measured at year 0 unless otherwise indicated. Values are means (standard deviations in parentheses) or percentages.