Table.4 Deviation indices (% difference) comparing other spirometric references to our prediction equation
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%) |