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Table 4 Comparison of FEV 1 % and FVC% of the non-Korean equations with Choi's equation by age group

From: Discordance in Spirometric Interpretations Based on Korean and Non-Korean Reference Equations

  Age group Choi NHANES III Knudson Morris
  Value Value Difference from Choi (95% CI) Value Difference from Choi (95% CI) Value Difference from Choi (95% CI)
FEV1% 20-39 97.5 ± 10.0 94.0 ± 10.0 -1.8 ± 1.0† 97.6 ± 10.6 -5.3 ± 3.7† 117.5 ± 13.0 -25.2 ± 4.1†
     (-1.9 - -1.6)   (-5.7 - -4.9)   (-25.7 - -24.8)
  40-49 98.9 ± 11.3 97.8 ± 11.2 -4.3 ± 1.0† 104.7 ± 13.2 -11.1 ± 4.6† 126.9 ± 14.5 -33.3 ± 4.2†
     (-4.4 - -4.1)   (-11.7 - -10.5)   (-33.8 - -32.7)
  ≥ 50 97.6 ± 11.3 97.5 ± 15.5 -6.6 ± 1.7† 106.3 ± 17.6 -15.4 ± 6.1† 131.4 ± 21.2 -40.5 ± 7.4†
     (-6.8 - -6.4)   (-16.1 - -14.7)   (-41.4 - -39.7)
  Total 97.6 ± 11.3 96.3 ± 12.7 -4.2 ± 2.5† 102.7 ± 11.8 -10.5 ± 6.5† 125.1 ± 17.8 -32.9 ± 8.5†
     (-4.4 - -4.0)   (-11.0 - -10.1)   (-33.5 - -32.4)
FVC% 20-39 97.5 ± 10.0 95.3 ± 9.6 2.1 ± 2.1† 101.4 ± 10.4 -3.9 ± 4.3† 97.1 ± 10.0 0.4 ± 2.5*
     (1.9 - 2.3)   (-4.4 - -3.4)   (0.1 - 0.6)
  40-49 98.9 ± 11.3 99.6 ± 11.3 -0.8 ± 1.8† 111.0 ± 13.5 -12.1 ± 5.2† 102.5 ± 11.6 -3.6 ± 1.9†
     (-1.0 - -0.5)   (-12.8 - -11.4)   (-3.9 - -3.4)
  ≥ 50 97.6 ± 11.3 102.3 ± 13.0 -5.6 ± 3.2† 118.1 ± 16.2 -21.4 ± 8.2† 104.7 ± 13.2 -8.1 ± 2.6†
     (-6.0 - -5.3)   (-22.4 - -20.5)   (-8.3 - -7.8)
  Total 97.6 ± 11.3 99.0 ± 11.7 -1.5 ± 4.1† 110.1 ± 15.3 -12.5 ± 9.7† 101.4 ± 12.1 -3.8 ± 4.3†
     (-1.7 - -1.2)   (-13.1 - -11.8)   (-4.1 - -3.5)
  1. * p-value < 0.05, † p-value < 0.01 by paired t-test.