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Table 4 Comparison between spirometric values obtained by predicted equations of the present study with mean measured values and those of previous studies

From: Reference equations for spirometric indices from a sample of the general adult population in Nigeria

Parameters Age range (years) Subjects (No) FVC (Litres) FEV1 (Litres) Ratio (%) MMEF (Litres/second) PEFR (Litres/second)
Male (age = 38.5 years and height = 170.7)
 Predicted present study 18–65 358 3.82 3.27 84.3 4.78 9.27
 Mean present study 18–65 358 3.81 3.37 88.4 4.70 9.29
 SD    p = 0.97 p = 0.69 p = 0.53 p = 0.82 p = 0.98
 Elebute et al [14] 17–54 142 -- -- -- -- 8.08
 SD    -- -- -- -- p = 0.18
 Njoku et al [15] 15–60 668 - - - - 8.84
 SD    - - -   - p = 0.47
 Erhabor et al [16] 19–60 241 3.59 3.00 84.6 -- 8.71
 SD    p = 0.46 p = 0.31 p = 0.97 -- p = 0.30
 Mengesha et al [23] 18–47 143 4.48 3.62 -- -- 8.48
 SD    p = 0.10 p = 0.29 -- -- p = 0.63
 Golshan et al. [24] 21–82 1302 4.59 3.97 86.5 5.12 10.20
 SD    p = 0.004* p = 0.002* p = 0.67 p = 0.23 p = 0.12
 Ostrowski et al. [26] 40–80 49 5.50 4.45 -- -- --
 SD    p = 0.007* p = 0.02* -- -- --
 GLI Afro American [11] 3–95 1520 4.05 3.33 82.0 3.40  
 SD    p = 0.33 p = 0.76 p = 0.63 p < 0.01*  
Female (age = 42.5 and height = 156.8)
 Predicted present study 18–65 362 2.51 2.23 86.7 3.68 5.96
 Mean present study 18–65 362 2.52 2.24 89.5 3.66 5.91
 SD    p = 0.96 p = 0.95 p = 0.67 p = 0.94 p = 0.91
 Elebute et al [14] 17–44 88 -- -- -- -- 5.60
 SD    -- -- -- -- p = 0.61
 Njoku et al [15] 15–60 341 - - - - 5.99
 SD    - - - - p = 0.95
 Mengesha et al [23] 18–47 117 2.94 2.30 -- -- --
 SD    p = 0.12 p = 0.77 -- -- --
 Golshan et al [24] 21–80 1110 3.14 2.74 87.6 3.64 6.77
 SD    p < 0.001* p < 0.01* p = 0.87 p = 0.86 p = 0.04*
 Ostrowski et al [26] 40–80 87 3.45 2.93 -- -- --
 SD    p = 0.004* p = 0.01* -- -- --
 GLI Afro American [11] 3–95 2025 2.87 2.36 83.0 2.58  
 SD    p = 0.03* p = 0.33 p = 0.44 p < 0.01*  
  1. FVC forced vital capacity, FEV 1 forced expiratory volume in one second, ratio FEV1/FVC%, PEFR peak expiratory flow rate, MMEF maximal mid expiratory flow, GLI global lung finction initiative study, SD statistical significance, * = statistically significant difference