Table 3: Pulmonary function test prediction equations for rural females

Test, Units Equations R2 SEE
FVC, L -1.562 + 0.044H - 0.042A (SRHS) 0.710 0.374
-1.336 + 0.048H - 0.040A - 0.014W* (SRHS) 0.742 0.357
0.944 + 0.039H - 0.039A - 0.022AB** (SRHS) 0.777 0.333
-3.335 + 0.049 H - 0.024A [6] 0.660 0.427
-3.590 + 0.0491H - 0.0216A [1] 0.740 0.393
FEV1, L +0.493 + 0.026H** - 0.037A (SRHS) 0.806 0.234
+0.629 + 0.028H - 0.036A -0.009W* (SRHS) 0.825 0.225
+1.833 + 0.023H** - 0.035A - 0.012AB** (SRHS) 0.838 0.216
-1.901 + 0.037H - 0.025A [6] 0.730 0.340
-1.578 + 0.0342H - 0.0255A [1] 0.800 0.326
FEF25-75, L +6.073** - 0.007H - 0.044A (SRHS) 0.602 0.399
+6.094** - 0.006H - 0.044A + 0.001W (SRHS) 0.603 0.403
+5.613* - 0.006H - 0.044A + 0.004AB (SRHS) 0.605 0.402
N/A
+2.683 + 0.0154H - 0.0460A [1] 0.600 0.792
FEV1/FVC +128.74 - 0.263H* - 0.126A** (SRHS) 0.281 3.123
+127.81 - 0.279H** - 0.133A** + 0.059W (SRHS) 0.239 3.117
+113.22 - 0.233H* - 0.142A** + 0.137AB* (SRHS) 0.317 2.954
+ 104.509 - 0.089H - 0.182A [6] 0.200 5.680
+126.58 - 0.2020H - 0.252A [1] 0.430 5.260


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.