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Table 2 Unadjusted and adjusted association between lung function (mL) and socioeconomic status among boys (N = 1969)

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 = 0.03† P = 0.03† P = 0.74† P = 0.40†
   Lowest 0 0 0 0 0 0
   Intermediate 117 (36) 151 (41) 16 (27) 26 (30) -15 (31) 32 (34)
   Highest 266 (36) 323 (42) 61 (28) 68 (31) 12 (32) 28 (35)
Socioeconomic status at 15 y (tertiles) P < 0.001† P < 0.001† P = 0.01† P = 0.03† P = 0.60† P = 0.84†
   Lowest 0 0 0 0 0 0
   Intermediate 127 (37) 139 (42) 44 (26) 34 (28) 2 (38) 42 (42)
   Highest 294 (36) 344 (41) 64 (26) 64 (29) -17 (37) 14 (42)
Socioeconomic trajectory from birth to 15 y P < 0.001 P < 0.001 P = 0.10 P = 0.11 P = 0.99 P = 0.74
   Always poor 0 0 0 0 0 0
   Non-poor, poor 142 (55) 143 (63) 12 (38) -14 (42) 3 (60) 14 (66)
   Poor, non-poor 177 (45) 169 (52) 54 (32) 19 (35) 0 (46) 6 (51)
   Never poor 313 (39) 365 (45) 63 (28) 59 (31) -9 (42) 42 (46)
  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 separated for each gender.
  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) separated for each gender.
  5. † P-value of linear trend.