| Author [ref.] | a) 17.9 yrs, 160 cm | Author [ref.] | b) 18.0 yrs, 160 cm | ||||
| FEV1 | FVC | FEV1/FVC | FEV1 | FVC | FEV1/FVC | ||
| Polgar [7] | 3.09 | 3.42 | NA | ECSC/ERS [8] | 3.67 | 4.23 | 0.83 |
| Rosenthal [82] | 2.70 | 3.69 | 0.84 | Hankinson [17]¶ | 3.58 | 4.12 | 0.84 |
| Zapletal [83] | 2.93 | 3.53 | 0.85 | Stanojevic [13]# | 3.46 | 4.09 | 0.85 |
| Stanojevic [13]# | 3.45 | 4.08 | 0.85 | GLI 2012 | 3.61 | 4.13 | 0.88 |
| Wang [6] | 3.49 | 3.93 | 0.87 | ||||
| GLI 2012 | 3.61 | 4.12 | 0.88 | ||||
| Author [ref.] | c) 17.9 yrs, 180 cm | Author [ref.] | d) 18.0 yrs, 180 cm | ||||
| FEV1 | FVC | FEV1/FVC | FEV1 | FVC | FEV1/FVC | ||
| Polgar [7] | 4.30 | 4.69 | NA | ECSC/ERS [8] | 4.53 | 5.38 | 0.83 |
| Rosenthal [82] | 4.27 | 5.17 | 0.82 | Hankinson [17]¶ | 4.53 | 5.39 | 0.84 |
| Zapletal [83] | 4.11 | 4.99 | 0.85 | Stanojevic [13]# | 4.56 | 5.45 | 0.85 |
| Stanojevic [13]# | 4.55 | 5.44 | 0.85 | GLI 2012 | 4.69 | 5.49 | 0.86 |
| Wang [6] | 4.46 | 5.20 | 0.86 | ||||
| GLI 2012 | 4.68 | 5.47 | 0.86 | ||||
| Author [ref.] | e) 25 yrs, 175 cm | Author [ref.] | f) 55 yrs, 175 cm | ||||
| FEV1 | FVC | FEV1/FVC | FEV1 | FVC | FEV1/FVC | ||
| Crapo [84] | 4.45 | 5.32 | 0.84 | Crapo [84] | 3.71 | 4.67 | 0.79 |
| ECSC/ERS [8] | 4.31 | 5.09 | 0.83 | ECSC/ERS [8] | 3.44 | 4.31 | 0.77 |
| Hankinson [17]¶ | 4.44 | 5.36 | 0.83 | Hankinson [17]¶ | 3.63 | 4.74 | 0.77 |
| HSE [49] | 4.43 | 5.29 | 0.85 | HSE [49] | 3.60 | 4.63 | 0.79 |
| Knudson [85] | 4.39 | 5.24 | 0.84 | Knudson [85] | 3.52 | 4.35 | 0.81 |
| Stanojevic [13]# | 4.42 | 5.36 | 0.83 | Stanojevic [13]# | 3.63 | 4.75 | 0.77 |
| GLI 2012 | 4.46 | 5.32 | 0.85 | GLI 2012 | 3.65 | 4.66 | 0.79 |
FEV1: forced expiratory volume in 1 s; FVC: forced vital capacity; GLI: Global Lungs Initiative; ECSC: European Community for Steel and Coal; ERS: European Respiratory Society; HSE: Health Survey for England 1995–1996; NA: not available. #: all age; ¶: National Health and Nutritional Examination Survey (NHANES) III. The transition from one set of equations to another on the 18th birthday (a versus b or c versus d) is not smooth using older equations. The discontinuity, and the disparity between predicted values is much worse in those who are short for their age (a versus b), than in those of average height (c versus d). In adult males there is fair agreement between predicted values, although those derived from the ECSC/ERS are systematically lower than others for subjects ≥25 yrs of age (e versus f).