Welch Allyn Schiller AT-2plus - Knudson 76 Norm Values

AT-2plus User Guide Spirometry Supplement Page 39
Art. No. 2. 510339wa ©1999
AT-2plus User Guide Spirometry Supplement Page 39
Art. No. 2. 510339wa ©1999
Norm Values
Knudson 76 Norm Values
The Knudson 76 equations are valid for both males
and females in specific age groups as follows:
A: Age H: Height in inches
Norm Values
Knudson 76 Norm Values
The Knudson 76 equations are valid for both males and
females in specific age groups as follows:
A: Age H: Height in inches
Males Females
Age <25 yrs Age <20 yrs
FVC 0.1270 x H + 0.078 x A -5.508 0.0838 x H + 0.092 x A -3.469
FVC0.5 0.0762 x H +0.043 x A -3.054 0.0483 x H + 0.061 x A -1.738
FEV1 0.1168 x H + 0.045 x A - 4.808 0.0686 x H + 0.085 x A - 2.703
FEV3 0.1321 x H + 0.066 x A - 5.531 0.0838 x H + 0.086 x A - 3.417
FEV1/FVC -0.2210 x H - 0.140 x A + 103.64 -0.2819 x H - 0.109 x A + 107.38
FEF25 - 75 0.1499 x H + 0.0 x A - 5.443 0.0635 x H + 0.121 x A - 0.893
PEF 0.1981 x H + 0.166 x A - 8.060 0.1245 x H + 0.157 x A - 3.916
FEF25 0.1778 x H + 0.147 x A - 7.054 0.1118 x H + 0.144 x A + 3.365
FEF50 0.1295 x H + 0.081 x A - 4.975 0.0864 x H + 0.120 x A + 2.531
FEF75 0.0813 x H + 0.0 x A - 2.455 0.0 x H + 0.139 x A - 0.692
Age >25 yrs Age >20 yrs
FVC 0.1651 x H - 0.029 x A - 5.459 0.0940 x H - 0.022 x A - 1.774
FVC0.5 0.0940 x H - 0.017 x A - 2.746 0.0483 x H - 0.014 x A - 0.406
FEV1 0.1321 x H - 0.027 x A - 4.203 0.0686 x H - 0.021 x A - 0.794
FEV3 0.1600 x H - 0.031 x A - 5.245 0.0889 x H - 0.023 x A - 1.633
FEV1/FVC -0.2210 x H - 0.140 x A + 103.64 -0.2819 x H - 0.109 x A + 107.38
FEF25 - 75 0.1143 x H - 0.031 x A - 1.864 0.0533 x H - 0.024 x A - 1.171
PEF 0.2388 x H - 0.035 x A - 5.993 0.1245 x H - 0.025 x A - 0.735
FEF25 0.2235 x H - 0.035 x A - 5.618 0.1092 x H - 0.025 x A + 0.132
FEF50 0.1753 x H - 0.015 x A - 5.400 0.0889 x H - 0.013 x A - 0.444
FEF75 0.1118 x H - 0.012 x A - 4.143 0.0 x H - 0.014 x A - 3.042
Males Females
Age <25 yrs Age <20 yrs
FVC 0.1270 x H + 0.078 x A -5.508 0.0838 x H + 0.092 x A -3.469
FVC0.5 0.0762 x H +0.043 x A -3.054 0.0483 x H + 0.061 x A -1.738
FEV1 0.1168 x H + 0.045 x A - 4.808 0.0686 x H + 0.085 x A - 2.703
FEV3 0.1321 x H + 0.066 x A - 5.531 0.0838 x H + 0.086 x A - 3.417
FEV1/FVC -0.2210 x H - 0.140 x A + 103.64 -0.2819 x H - 0.109 x A + 107.38
FEF25 - 75 0.1499 x H + 0.0 x A - 5.443 0.0635 x H + 0.121 x A - 0.893
PEF 0.1981 x H + 0.166 x A - 8.060 0.1245 x H + 0.157 x A - 3.916
FEF25 0.1778 x H + 0.147 x A - 7.054 0.1118 x H + 0.144 x A + 3.365
FEF50 0.1295 x H + 0.081 x A - 4.975 0.0864 x H + 0.120 x A + 2.531
FEF75 0.0813 x H + 0.0 x A - 2.455 0.0 x H + 0.139 x A - 0.692
Age >25 yrs Age >20 yrs
FVC 0.1651 x H - 0.029 x A - 5.459 0.0940 x H - 0.022 x A - 1.774
FVC0.5 0.0940 x H - 0.017 x A - 2.746 0.0483 x H - 0.014 x A - 0.406
FEV1 0.1321 x H - 0.027 x A - 4.203 0.0686 x H - 0.021 x A - 0.794
FEV3 0.1600 x H - 0.031 x A - 5.245 0.0889 x H - 0.023 x A - 1.633
FEV1/FVC -0.2210 x H - 0.140 x A + 103.64 -0.2819 x H - 0.109 x A + 107.38
FEF25 - 75 0.1143 x H - 0.031 x A - 1.864 0.0533 x H - 0.024 x A - 1.171
PEF 0.2388 x H - 0.035 x A - 5.993 0.1245 x H - 0.025 x A - 0.735
FEF25 0.2235 x H - 0.035 x A - 5.618 0.1092 x H - 0.025 x A + 0.132
FEF50 0.1753 x H - 0.015 x A - 5.400 0.0889 x H - 0.013 x A - 0.444
FEF75 0.1118 x H - 0.012 x A - 4.143 0.0 x H - 0.014 x A - 3.042