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Table 5 Concordance coefficient of obstructive lung staging in non-Korean equations and in Choi's equation

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

Ages Obstructive lung disease staging¶ Choi NHANES III Knudson Morris
n (%) n (%) Agreement with Choi n (%) Agreement with Choi n (%) Agreement with Choi
20-39 mild 6 (2.0) 7 (2.3) 6 (100) 8 (2.7) 6 (100) 12 (4.0) 6 (100)
  moderate 7 (2.3) 6 (2.0) 6 (85.7) 5 (1.7) 5 (71.4) 1 (0.3) 1 (14.3)
  Kappa    0.960†   0.920†   0.762†
40-49 mild 18 (7.8) 18 (7.8) 18 (100) 20 (8.6) 18 (100) 21 (9.1) 18 (100)
  moderate 3 (1.3) 3 (1.3) 3 (100) 1 (0.4) 1 (33.3) 0 (0.0) 0 (0.0)
  Kappa    1.000†   0.948†   -*
≥ 50 mild 48 (16.3) 60 (20.4) 48 (100) 67 (22.8) 48 (100) 81 (27.6) 48 (100)
  moderate 39 (13.3) 27 (9.2) 27 (69.2) 20 (6.8) 20 (51.3) 6 (2.0) 6 (15.4)
  Kappa    0.911†   0.859†   0.754†
Total mild 72 (8.7) 85 (10.3) 72 (100) 95 (11.5) 72 (100) 114 (13.8) 72 (100)
  moderate 49 (5.9) 36 (4.4) 36 (73.5) 26 (3.2) 26 (53.1) 7 (0.8) 7 (14.3)
  Kappa    0.939†   0.893†   0.804†
  1. Agreement rate% = by non-Korean equation / by Choi's Equation.
  2. * Kappa not available.
  3. † p-value < 0.01.
  4. ¶Mildly obstructive: FEV1/FVC (%) < 70 and FEV1% ≥ 80.
  5. Moderately obstructive: FEV1/FVC (%) < 70 and FEV1% < 80.