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

From: Spirometric reference equations for Cameroonians aged 4 to 89 years derived using lambda, mu, sigma (LMS) method

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%)
  1. FEV1, forced expiratory volume in 1 s (FEV1); FVC, forced vital capacity; FEF25-75%, forced mid-expiratory flow