Table 2: Pulmonary function test prediction equations for rural males

 Test, Units Equations R2 SEE FVC, L -6.068** + 0.073H† - 0.034A† (SRHS) 0.678 0.540 -6.616** + 0.079H† - 0.033A† - 0.007W (SRHS) 0.687 0.539 -5.958** + 0.077H† - 0.030A† - 0.011AB (SRHS) 0.692 0.534 -5.473 + 0.067H - 0.025A [6] 0.560 0.589 -4.650 + 0.060H - 0.0214A [1] 0.540 0.644 FEV1, L -3.655** + 0.052H† - 0.031A† (SRHS) 0.729 0.376 -3.933** + 0.055H† - 0.031A† - 0.003W (SRHS) 0.733 0.378 -3.589** + 0.055H† - 0.029A† - 0.007AB (SRHS) 0.738 0.374 -2.832 + 0.047H - 0.030A [6] 0.620 0.500 -2.190 + 0.041H - 0.0244A [1] 0.640 0.486 FEF25-75, L +0.299 + 0.032H* - 0.041A† (SRHS) 0.388 0.753 +0.531 + 0.029H - 0.042A† + 0.003W (SRHS) 0.389 0.761 +0.305 + 0.032H* - 0.041A† -0.001AB (SRHS) 0.388 0.762 N/A +2.133 + 0.0204H - 0.0380A [1] 0.420 0.962 FEV1/FVC +111.397† - 0.151H* - 0.110A* (SRHS) 0.150 4.189 +112.751† - 0.167H - 0.112A* + 0.017W (SRHS) 0.153 4.233 +111.279† - 0.156H - 0.114A + 0.012AB (SRHS) 0.151 4.238 +109.396 - 0.113H - 0.210A [6] 0.240 5.821 +110.49 - 0.130H - 0.152A [1] 0.260 4.780

Abbreviations: FVC: Forced Vital Capacity, FEV1: Forced Expiratory Volume in the first second, FEF25-75: Forced Expiratory Flow during the middle half of the Forced Vital Capacity, H: Height in cm, A: Age in years, W: Weight in Kg, AB: Abdominal girth in cm, R2: Coefficient of determination, SEE: Standard error of the estimate, SRHS: Saskatchewan Rural Health Study, Statistically significant regression coefficients were indicated using * if p-value <0.05; ** if p-value <0.01; † if p-value <0.001.