Table 1– Previously published reference equations for predicting 6-min walk distance in healthy adults based on an individual's age, sex, height and weight
First author [Ref.]Publication yearStudy populationsReference equationsR2
Enright 111998USA; 117 males, 173 females;age 40–80 yrsMales: (7.57×Ht)-(5.02×age)-(1.76×Wt)-3090.40
Females: (2.11×Ht)-(5.78×age)-(2.29×Wt)+667
Troosters 131999Belgium; 29 males, 22 females;age 50–85 yrs218+(5.14×Ht)-(5.32×age)-(1.8×Wt)+(51.31×sex)0.66
Male = 1, female = 0
Gibbons 122001Canada; 41 males, 38 females;age 20–80 yrs868.8-(age×2.99)-(sex×74.7)0.41
Male = 0, female = 1
Chetta 102006Italy; 48 males, 54 females;age 20–50 yrs518.853+(1.25×Ht)-(2.816×age)-(39.07×sex)0.42
Male = 0, female = 1
  • Ht: height in cm; Wt: weight in kg. R2 indicates the degree of inter-subject variance explained by the equation.