### Description

The Forced Expiratory Volume in 1 second (FEV1) can be predicted in pediatric patients based on height and other physical characteristics.

NOTE: Quanjer et al provides many additional equations for FEV1.

Linear Equations Based on Height

FEV1 in liters for males 5-18 years old and 42-59 inches tall (Dickman) =

= (0.085 * (height in inches)) - 2.855

FEV1 in liters for males 5-18 years old and 60-78 inches tall (Dickman) =

= (0.121 * (age in years)) + (0.143 * (height in inches)) - 7.864

FEV1 in liters for females 5-18 years old and 42-59 inches tall (Dickman) =

= (0.074 * (height in inches)) - 2.482

FEV1 in liters for females 5-18 years old and 60-78 inches tall (Dickman) =

= (0.085 * (age in years)) + (0.10 * (height in inches)) - 4.939

FEV1 in liters for 4 to 18 years (Weng and Levinson) =

= (0.040 * (height in cm)) - 3.99

FEV1 in liters for boys 5 to 18 years (Godfrey) =

= (0.051 * (height in cm)) - 4.77

FEV1 in liters for girls 5 to 18 years (Godfrey) =

= (0.041 * (height in cm)) - 3.35

FEV1 in liters for boys 4-19 years < 162.6 cm (Rosenthal) =

= (0.034 * (height in cm)) - 2.780

FEV1 in liters for boys 4-19 years >= 162.6 cm (Rosenthal) =

= (0.052 * (height in cm)) - 5.108

FEV1 in liters for girls 4-19 years < 152.6 cm (Rosenthal) =

= (0.033 * (height in cm)) -2.734

FEV1 in liters  for girls 4-19 years >= 152.6 cm (Rosenthal) =

= (0.041 * (height in cm)) - 3.680

Exponent of Height

FEV1 in liters for 7 to 19 year olds (Hsu et al) =

= A * 10^(-3) * ((height in cm)^B)

Boys 7 - 19 years

A

B

black

1.03

2.92

hispanic

1.73

2.85

white

0.774

3.00

Girls 7 - 19 years

A

B

black

1.14

2.89

hispanic

1.61

2.85

white

3.79

2.68

FEV1 in liters (Polgar and Promadhat) =

= (0.0000021 * ((height in cm)^2.8))

FEV1 in liters for 5 to 25 years of age (Lebowitz et al) =

= 6.844 + (0.040 * (age in years)) - (0.281 * (height in inches)) + (0.003 * ((height in inches)^2))

Natural Logarithm

FEV1 in liters (Wang et al) =

= EXP((B * (LN(height in meters))) + A)

Boys - Age in Years

A

B

6

-0.109

2.252

7

-0.104

2.270

8

-0.089

2.257

9

-0.063

2.197

10

-0.057

2.212

11

-0.093

2.324

12

-0.161

2.512

13

-0.292

2.843

14

-0.329

2.983

15

-0.141

2.709

16

0.062

2.409

17

0.262

2.099

18

0.251

2.129

Girls - Age in Years

A

B

6

-0.109

1.949

7

-0.144

2.243

8

-0.137

2.239

9

-0.123

2.222

10

-0.161

2.364

11

-0.223

2.558

12

-0.264

2.709

13

-0.153

2.535

14

0.046

2.178

15

0.148

2.008

16

0.181

1.972

17

0.176

1.992

18

0.152

2.031