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Table 6 Concordance coefficient of restrictive lung disease in non-Korean equations and Choi's equation

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

Ages Choi NHANES III Knudson Morris
  n (%) n (%) Agreement with Choi n (%) Agreement with Choi n (%) Agreement with Choi
20-39 8 (2.7) 10 (3.3) 7 (87.5) 3 (1.0) 1 (12.5) 8 (2.7) 6 (75.0)
    0.771*   0.170*   0.743*
40-49 10 (4.3) 9 (3.9) 7 (70.0) 1 (0.4) 0 (0.0) 3 (1.3) 2 (20.0)
    0.726*   -0.008   0.294*
50- 22 (7.5) 8 (2.7) 8 (36.4) 2 (0.7) 2 (9.1) 5 (1.7) 5 (22.7)
    0.514*   0.156*   0.352*
Total 40 (4.8) 27 (3.3) 22 (55.0) 6 (0.7) 3 (7.5) 16 (1.9) 13 (32.5)
    0.643*   0.119*   0.449*
  1. Agreement n (%) = n (by non-Korean equation / by Choi's equation *100).
  2. * p-value < 0.01.
  3. †Restrictive: FVC% < 80.