Abstract
Aim: To estimate the agreement of Russian equations (Klement), ECCS and NhanesIII spirometry evaluating systems in determining the types of ventilation abnormalities by predicted and LLN (5th percentile) values.
Materials and methods: The study enrolled 7,779 Caucasians examined in pulmonary clinics of St.Petersburg Pavlov's State Medical University in 2005-2011: 3,584 males (mean age 47.40±0.25, mean height 175.44±0.18) and 4,195 females (mean age 49.66±0.20, mean height 162.29±0.10). The cases that can not be classified as norm, obstruction or restriction, were accumulated in the "mixed" group.
Conclusion: The best agreement was obtained by ECCS and Klement systems both in predicted values and LLN. NhanesIII significantly differs from both Klement and ECCS in LLN for all groups. In predicted values these three systems agreed in obstruction but still generally disagree in norm and restriction.
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