Table 1.
Socioeconomics status (SES) and ozone exposure of the boys studied (means and Standard deviation [SD]).
Table 2.
Socioeconomics status (SES) and ozone exposure of the girls studied (means and Standard deviation [SD]).
Table 3.
Characteristics of the studied population in phase 4 of the study.
SD = Standard deviation; BMI = Body mass index; FEV1 = Forced expiratory volume at 1 sec; FVC = Forced vital capacity; FEV1/FVC = ratio of FEV1 and FVC.
Table 4.
Characteristics of the children studied by tertile of parents’ schooling.
Table 5.
Longitudinal models for spirometric variables and Socioeconomic status (SES), both genders taken together.
Fig 1.
Relationship between height-for-age Z-score and spirometric, sitting height/standing height, and income.
(A) Lung function (FVC and FEV1), (B) sitting height/standing height, and (C) monthly family income as a function of height for age as Z-score (horizontal axis). Line and shadows represent linear or quadratic regression and 95% Confidence intervals (95% CI) of the regression models. Symbols are means of terciles for height-for-age as described in the text, showing good fit of the models.
Fig 2.
Forced expiratory volume at 1 sec (FEV1) and Forced vital capacity (FVC) expected as a function of age by tertiles of monthly family income.
(A) FEV1 and (B) FVC as a function of age (horizontal axis). Lung function increases with growth and development in alinear fashion vs. age, but also varies with Socioeconomic status (SES) (shown as terciles in different lines), especially at the end of the observation.