Table 3.
Equations to predict the 6 minute walk distance in children and adolescents
|
Model |
Age-adjusted |
p |
+ height-, weight- adjusted |
p |
+ vitals and physical activity score (PAS) |
p |
|---|---|---|---|---|---|---|
| Population | (age in years (y)) | (age in y, height in m, weight in kg) | (heart rate (HR) in bpm, PAS 1-4) | |||
|
General |
11.89 *y + 486.1 |
.000, .000 |
391.9*m -2.41* kg + 140.2 |
.000, .000, .000 |
192.69*m + 1.27*exHR + 161.55 |
.000, .000, .000 |
|
Males |
15.36 *y + 456.92 |
.000, .000 |
13.40*y -2.16*kg + 196.53*m + 276.92 |
.001, .001, .017, .000 |
14.38*y + 1.21*exHR – 2.12*kg + 166.66*m + 146.56 |
.000, .000, .001, .037 |
|
<13 y |
24.18*y + 385.18 |
.000, .000 |
As age-adjusted |
|
28.62*y + 1.26*exHR -2.034*kg + 239.29 |
.000, .000, .014, .000, |
| ≥13 y |
13.08*y + 476.69 |
.031, .000 |
As age-adjusted |
|
1.01*exHR + 13.3*y + 338.25 |
.001, .022, .000 |
|
Females |
8.623*y + 513.7 |
.000, .000 |
372.3*m -2.635*kg + 172.05 |
.000, .000, .001 |
152.58*m + 1.38*exHR + 197.97 |
.000, .000, .000 |
|
<12 y |
20.83*y + 413.94 |
.000, .000 |
330.07*m + 153.3 |
.000, .000 |
279.5*m + .87*exHR + 102.45 |
.000, .000, .024 |
| ≥ 12 y | -8.66*y + 757.42 | .000, .036 | -1.867 * kg + 734.29 | .001, .000 | 1.79*exHR – 1.28*restHR – 2.55*kg + 203.3*m + 7.83*PAS + 298.6 | .000, .000, .000, .023, .032, .030 |
*multiplied by, Y years, m meters of body height, kg kilogram body weight, HR heart rate, restHR heart rate before the 6MWD, exHR HR after the 6MWD. PAS physical activity score as measure of self-reported activity going from 0 (0 hours weekly of physical activity beside school sports to >4 hours of physical activity) to 4 P values are given for all parameters added in the equation model in order that the reader can see the impact of each measure to the equation.