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Table 3 Unadjusted and adjusted association between lung function and socioeconomic status among girls (N = 2036)

From: Socioeconomic trajectory from birth to adolescence and lung function: prospective birth cohort study

Variable Unadjusted Model 1* Model 2**
  FEV1 (mL) FVC (mL) FEV1 (mL) FCV (mL) FEV1 (mL) FVC (mL)
  Beta (SE) Beta (SE) Beta (SE) Beta (SE) Beta (SE) Beta (SE)
Socioeconomic status at birth (tertiles) P < 0.001† P < 0.001† P = 0.002† P = 0.06† P = 0.08† P = 0.25†
   Lowest 0 0 0 0 0 0
   Intermediate 41 (23) 38 (28) 30 (20) 26 (23) 15 (20) 14 (23)
   Highest 144 (24) 138 (28) 63 (21) 44 (24) 36 (21) 27 (24)
Socioeconomic status at 15 y (tertiles) P < 0.001† P < 0.001† P < 0.001† P = 0.002† P = 0.001† P = 0.005†
   Lowest 0 0 0 0 0 0
   Intermediate 104 (23) 92 (27) 56 (19) 34 (22) 60 (24) 37 (28)
   Highest 183 (24) 174 (28) 92 (20) 72 (23) 87 (25) 83 (30)
Socioeconomic trajectory from birth to 15 y P < 0.001 P < 0.001 P < 0.001 P = 0.06 P = 0.004 P = 0.07
   Always poor 0 0 0 0 0 0
   Non-poor, poor 49 (35) 43 (41) 36 (29) 27 (33) 48 (38) 33 (45)
   Poor, non-poor 117 (30) 108 (35) 73 (25) 54 (28) 71 (30) 45 (36)
   Never poor 174 (25) 164 (30) 87 (21) 63 (24) 96 (27) 83 (32)
  1. 1993 Pelotas (Brazil) Birth Cohort, 2008.
  2. FEV1: Forced expiratory volume; FVC: forced vital capacity
  3. * Adjusted for age, height, weight and BMI at 15y.
  4. ** Adjusted for Model 1 plus parental variables (smoking and wheezing when adolescents were 11 years of age) and adolescent variables (wheezing, smoking, pubertal stage, physical activity, skin color, allergy).
  5. † P-value of linear trend.