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