|
Reference equations
|
Males
| | | |
Females
| | | |
|---|
| |
Mean FEV1, L (% difference)
|
Mean FVC, L (% difference)
|
Mean FEV1/FVC (% difference)
|
FEF25-75%, L/S (% difference)
|
Mean FEV1, L (% difference)
|
Mean FVC, L (% difference)
|
Mean FEV1/FVC (% difference)
|
FEF25-75%, L/S (% difference)
|
|---|
|
Children (4–12 years)
| | | | | | | | |
|
Current study
|
1.49
|
1.63
|
0.92
|
2.00
|
1.48
|
1.62
|
0.92
|
1.99
|
|
GLI for African American
|
1.49 (0%)
|
1.70 (+ 4.3)
|
0.89 (− -3.3%)
|
1.82 (− 9.0%)
|
1.54 (+ 4.1%)
|
1.72 (+ 6.2%)
|
0.90 (− 2.2%)
|
2.04 (+ 2.5%)
|
|
GLI for other ethnic group
|
1.63 (+ 9.4%)
|
1.85 (+ 13.5%)
|
0.89 (− 3.3%)
|
1.98 (− 1.0%)
|
1.66 (+ 12.2%)
|
1.85 (+ 14.2%)
|
0.91 (− 1.1%)
|
2.19 (+ 10.1%)
|
|
Nigerian
|
/
|
/
|
/
|
/
|
/
|
/
|
/
|
/
|
|
Adolescents (13–18 years)
| | | | | | | | |
|
Current study
|
2.70
|
3.04
|
0.89
|
3.23
|
2.51
|
2.79
|
0.90
|
3.20
|
|
GLI for African American
|
2.66 (− 1.5%)
|
3.04 (0%)
|
0.88 (− 1.1%)
|
3.12 (− 3.4%)
|
2.60 (+ 3.6%)
|
2.91 (+ 4.3%)
|
0.90 (0%)
|
3.24 (+ 1.3%)
|
|
GLI for other ethnic group
|
2.90 (+ 7.4%)
|
3.31 (+ 8.9%)
|
0.88 (− 1.1%)
|
3.39 (+ 5.0%)
|
2.81 (+ 12.0%)
|
3.12 (+ 11.8%)
|
0.90 (0%)
|
3.48 (+ 8.8%)
|
|
Nigerian
|
3.90 (+ 44.4%)
|
4.51 (+ 48.4%)
|
0.87 (-2.2%)
|
5.80 (+ 79.6%)
|
2.83 (+ 12.7%)
|
3.20 (+ 14.7%)
|
0.89 (− 1.1%)
|
4.96 (+ 55%)
|
|
Adults (19–88 years)
| | | | | | | | |
|
Current study
|
3.27
|
3.81
|
0.85
|
4.30
|
2.42
|
2.83
|
0.85
|
3.48
|
|
GLI for African American
|
3.40 (+ 4.0%)
|
4.11 (+ 7.9%)
|
0.83(-2.4%)
|
3.48 (− 19.1%)
|
2.59 (+ 7.0%)
|
3.09
(+ 9.2%)
|
0.84 (− 1.2%)
|
2.87 (− 17.5%)
|
|
GLI for other ethnic group
|
3.71 (+ 13.5%)
|
4.47 (+ 17.3%)
|
0.83 (− 2.4%)
|
3.79 (− 11.9%)
|
2.80 (+ 15.7%)
|
3.32 (+ 17.3%)
|
0.85 (0%)
|
3.07 (− 11.8%)
|
|
Nigerian
|
3.45 (+ 5.2%)
|
4.02 (+ 5.5%)
|
0.85 (0%)
|
5.01 (+ 16.5%)
|
2.54 (+ 5.0%)
|
2.85 (+ 0.7%)
|
0.88 (+ 3.5%)
|
4.32 (+ 24.1%)
|
- FEV1, forced expiratory volume in 1 s (FEV1); FVC, forced vital capacity; FEF25-75%, forced mid-expiratory flow
