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Table 6 Multiple regression coefficients (β) of the lung function parameters (Y)* versus anthropometric variables (in asymptomatic subjects)(x)

From: Reference values of Forced Expiratory Volumes and pulmonary flows in 3–6 year children: a cross-sectional study

Lung function parameters Sex (males) Age (years) Height (cm) BMI (%) Weight (Kg) Costant N R^2 RSE
FVC -0.049b 0.018 0.026c 0.015c [0.011] -2.042c 328 0.57 0.15
FEV1 -0.042b 0.038 0.023c 0.017c [0.013] -1.907c 409 0.59 0.13
FEV0.75 -0.034c 0.023b 0.022c 0.015b [0.008] -1.729c 494 0.59 0.12
FEV0.5 -0.031c 0.024b 0.017c 0.011b [0.001] -1.311c 564 0.55 0.11
MEF75 0.059 0.108b 0.046c 0.024c [-0.113] -3.385c 328 0.41 0.39
MEF50 0.002 [0.024] 0.033c [0.015] [-0574] -2.269c 328 0.29 0.32
MEF 25 0.012 [-0.005] 0.018c [0.075] [-0.538] -1.152c 328 0.19 0.22
  1. a = p < 0.05; b= p < 0.01; c = p < 0.001;
  2. BMI = body mass index;
  3. β = Multiple Regression Coefficient;
  4. FVC = forced vital capacity;
  5. FEV1= forced expiratory volume in one second;
  6. FEV0.75 = forced expiratory volume in 3/4 of a second;
  7. FEV0.5 = forced expiratory volume in half a second;
  8. MEF75 = instantaneous expiratory flow when 25% of FVC has to be expired
  9. MEF50 = instantaneous expiratory flow when 50% of FVC has to be expired
  10. MEF25 = instantaneous expiratory flow when 75% of FVC has to be expired
  11. [ ] brackets variables = excluded by log-likelihood ratio test because collinear or NS and not influent.
  12. * Reference values were computed as y' = Summ(BX)+constant; the 5 th percentiles of reference values "as normality limit" was computed by subtracting to y' the 1.64* Root MSE