Measuring height of bedridden patients can be difficult. One way to estimate height, is by measuring the lower leg length (LLL); the length between the length of a person's foot till the knee. With a special formula, this information can be used to estimate the full body length.
How to measure?
Formula 1: the lower leg length (LLL)
- Men: length = (2.31 * LLL) + 51.1
- Woman: length = (1.84 * LLL) + 70.2
Formula 2: The lower leg length (LLL) and the age in years
- Men: length = (2.30 x LLL) – (0.063 * age) + 54.9
- Woman: length = (1.91 x LLL) – (0.098 * age) + 71.3
This formula is obtained by taking measurements in a healthy research group of 78 men and 82 women in the age of 17-70 years. Formula 1 is easier to use, however formula 2 is more accurate. According to Han (1996) the length would be approached with a maximum deviation of 6.5 cm as equation 1 is used. Using formula 2 is better (which is not specified).
- White male: L= 78,31 + (1,94 * LLL) -(0,14 * age)
- White woman: L= 82,21 + (1,85 * LLL) - (0,21 * age)
- White male: L= 74,48 + (2,03 * LLL) -(0,15 * age)
- White woman: L= 68,74 + (2,07 * LLL) - (0,16 * age)
Alternative formulas for the elderly
- Men: length = (2.02 x LLL) – (0.04 * age) + 64.19
- Woman: length = (1.83 x LLL) – (0.24 * age) + 84.88