Classical regression equations of spirometric parameters are not applicable for diagnosing spirometric abnormalities in adipotic adults

Figure 1 Distributions of measured forced vital capacity and forced expiratory volume after one second along age axis in cohort A. A: Forced vital capacity (FVC) in men; B: Forced expiratory volume after one second (FEV₁) in men; C: FVC in women; D: FEV₁ in women.

Figure 2 Comparison of measured spirometric parameters of men in cohort A and reference means calculated from regression equations constructed for non-adipotic men. Horizontal axis: Measured values; Vertical axis: Values predicted from the non-adipotic regression equation[13]; Red line: Line on identity. FVC: Forced vital capacity; PEF: Peak expiratory flow; FEV₁: Forced expiratory volume after one second.

Figure 3 Comparison of measured spirometric parameters of women in cohort A and reference means calculated from regression equations constructed for non-adipotic women. Horizontal axis: Measured values; Vertical axis: Values predicted from the non-adipotic regression equation[13]; Red line: Line on identity. FVC: Forced vital capacity; PEF: Peak expiratory flow; FEV₁: Forced expiratory volume after one second.