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Table 1 Descriptive values (mean and SD) for lung function (in liters) according to the socioeconomic status

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

Variable Boys (n = 1969) Girls (n = 2036)
  FEV1 FVC FEV1 FVC
Socioeconomic status at birth (tertiles) P < 0.001 P < 0.001 P < 0.001 P < 0.001
   Lowest 3.35 (0.66) 3.87 (0.75) 2.88 (0.44) 3.25 (0.53)
   Intermediate 3.47 (0.68) 4.02 (0.79) 2.92 (0.42) 3.29 (0.49)
   Highest 3.61 (0.62) 4.19 (0.71) 3.02 (0.44) 3.38 (0.51)
Socioeconomic status at 15 y (tertiles) P < 0.001 P < 0.001 P < 0.001 P < 0.001
   Lowest 3.33 (0.67) 3.85 (0.77) 2.84 (0.45) 3.21 (0.52)
   Intermediate 3.45 (0.64) 3.99 (0.73) 2.94 (0.42) 3.30 (0.51)
   Highest 3.62 (0.66) 4.19 (0.75) 3.02 (0.42) 3.38 (0.49)
Socioeconomic trajectory from birth to 15 y P < 0.001 P < 0.001 P < 0.001 P < 0.001
   Always poor 3.27 (0.65) 3.79 (0.76) 2.82 (0.45) 3.19 (0.55)
   Non-poor, poor 3.41 (0.71) 3.94 (0.80) 2.87 (0.43) 3.24 (0.47)
   Poor, non-poor 3.45 (0.66) 3.96 (0.76) 2.94 (0.41) 3.30 (0.51)
   Never poor 3.58 (0.64) 4.16 (0.74) 3.00 (0.43) 3.36 (0.50)
Total 3.46 (0.66) 4.00 (0.76) 2.93 (0.44) 3.30 (0.52)
  1. 1993 Pelotas (Brazil) Birth Cohort, 2008.
  2. FEV1: Forced expiratory volume; FVC: forced vital capacity