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. Author manuscript; available in PMC: 2014 Jan 1.
Published in final edited form as: Pediatr Pulmonol. 2012 Mar 19;48(1):20–26. doi: 10.1002/ppul.22538

Table 2.

Comparison of spirometric outcomes between healthy Black and White children according to two reference equations

Black
(B)
White
(W)
Mean Difference
(95%CI, B-W)
N (% male) 214 (40%) 186 (50%)
Wang et al:11
FEV1 % pred. 99.9 (12.4) 104.4 (12.9) −4.3 (−6.8; −1.8)**
FVC% pred. 103.0 (13.0) 104.4 (12.9) −1.4 (−4.0; −1.1)
FEV1/FVC % pred. 97.4 (7.6) 99.8 (6.9) −2.5 (−3.9; −1.1)**
All-Age:10
FEV1 % pred. 86.6 (10.2) 102.1 (12.5) −15.5 (−17.7;−13.3)***
FVC % pred. 90.1 (11.2) 103.5 (12.3) −13.5 (−15.8;−11.2)***
FEV1/FVC % pred. 95.4 (7.6) 97.7 (6.6) −2.3 (−3.7; −0.9)**

Unless stated otherwise, results presented as mean (SD),

*

p<0.05,

**

p<0.005,

***

p<0.0005

Footnote: Wang et al equations have ethnic specific equations and were calculated respectively. All-age equations are based on White subjects, no ethnic adjustment was made in this table. These results are presented in more detail in the OLS (Table E6)