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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