Table 6 Effect estimates from fitted linear mixed effects models for each forced vital capacity (FVC) and forced expiratory volume in one second (FEV1).

From: A comparison of alternative selection methods for reporting spirometric parameters in healthy adults

Selection method (fixed effect in fitted mixed model)

Response variable

Average difference in response variable relative to model reference level (ATS/ERS standard) (L)

p value

ATS/ERS mean

FEV1

− 0.08

< 0.001

FVC

− 0.08

< 0.001

Mean of all

FEV1

− 0.08

< 0.001

FVC

− 0.07

< 0.001

Mean of 3 largest

FEV1

− 0.02

0.06

FVC

− 0.01

0.25

Peak effort

FEV1

− 0.04

< 0.001

FVC

− 0.04

< 0.001

  1. The effect estimate here represents the average difference in outcome variable (FEV1 or FVC) between the alternative selection method versus the American Thoracic and European Respiratory Societies (ATS/ERS) standard method. A p value < 0.05 indicates the selection method was statistically significantly different from the ATS/ERS selection method.
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