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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 3.

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

	Black (B)	White (W)	Mean Difference (95%CI; B-W)
n (%male)	68 (43%)	115 (45%)
By Zapletal:¹³
FRC % pred.	86.6 (12.3)	95.1 (15.6)	−8.5 (−12.8; −4.1)^***
RV % pred.	109.0 (21.8)	107.8 (24.5)	1.2 (−5.9; 8.2)
TLC % pred.	88.6 (9.2)	96.9 (10.0)	−8.2 (−11.2; −5.3)^***
RV/TLC % pred.	122.5 (21.2)	110.8 (20.1)	11.8 (5.5; 18.1)^***
By Rosenthal:¹⁴
FRC % pred.	86.2 (12.6)	91.2 (15.4)	−5.8 (−10.1; −1.4)^*
RV % pred.	103.7 (20.0)	99.0 (23.4)	4.7 (−2.0; 11.4)
TLC % pred.	94.2 (9.8)	101.7 (11.0)	−7.5 (−10.6; −4.3)^***
RV/TLC % pred.	110.2 (19.0)	96.9 (19.0)	13.2 (7.5; 19.0)^***

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

^*

p<0.05,

^**

p<0.005,

^***

p<0.0005

Footnote: Equations by Zapletal and Rosenthal are based on White children. No ethnic adjustment was applied in this table.