Several linear regression investigation was first utilized, with a study of the possibility of good nonlinear matchmaking established from the plus quadratic and you can cubic models. Modified [Roentgen.sup.2] and you may basic mistake out of imagine (SEE) values were utilized examine the newest efficiency of https://sugardaddydates.org/sugar-daddies-usa/la/ the predictive design off BF%.
All the records regarding p was in fact a couple-sided and you will p less than 0.05 is actually experienced mathematically significant. The analyses was indeed performed having fun with STATA software adaptation several.0 (STATA Corp, College or university Channel, Texas, USA) and you may SPSS version 17.0 (SPSS Inc., il, USA).
3.1. Study Population and Baseline Characteristics. All 2,771 participants in this study were over 18 years and comprised 64% women with a median age of 52 years (IQR, 43-60) and 36% men with a median age of 60 years (IQR, 47-68). The BF% in men was statistically significantly lower than in women (27% and 34%, resp.; p < 0.001). The difference in HWDI between men and women was also statistically significant (101 [IQR, 95-107] for men and 98 [IQR, 92-104] for women; p < 0.001) (see Table 1).
Within our studies, HWDI, a comparatively the fresh new obesity dimension sign, is discover to have an inverse experience of BF% both in everyone
Shape step 1 shows the connection between mediocre Body mass index and you may age. It had been found that, throughout the ages of 18 to help you 39 years, the fresh new imply Body mass index grows once the many years develops however,, immediately after getting together with 60 years old, the fresh mean Body mass index reduces given that years increases (get a hold of Shape 1(a)). The reverse can be found into relationship ranging from indicate HWDI and you can many years.
3.2. Relationship between HWDI and BF%. Figure 2 shows the relationship between HWDI and BF%. Pearson’s correlation coefficient (r) = -0.200 (p < 0.001) in men and r = -0.473 (p < 0.001) in women. In contrast, the direct relationship was found between BMI and BF%, r = 0.144 (p < 0.001) in men and r = 0.421 (p < 0.001) in women. Furthermore, the relationship between HWDI and BF% was statistically significant even when analyzed with respect to age group and gender (p < 0.001) (see Figure 3).
Mathematically, a keen inverse dating ranging from HWDI and BF% try found as HWDI enhanced while you are BF% well worth somewhat decreased
3.3. The Effect of Age, Gender, and HWDI on BF%. The study of the effect of age, gender, and HWDI on BF% showed all three variables’ relationship with BF% to be statistically significant for building a prediction model (p < 0.001 for all variables). HWDI and BF% by age and gender resulted in r = -0.629/ - 0.518 (men/women) for the 18-39-year age group, r = -0.372/ - 0.560 for the 40-59-year age group, and r = -0.125/ - 0.369 for age group over 60 years (see Figure 3).
3.4. Predictive Modeling of BF% by Gender. In this study, several forms of relationship between HWDI and BF% were studied: linear, quadratic, and cubic. However, Figure 3 shows that the relationship tended to be in linear form more than the others, and so we elected to use a linear form in the construction of the BF% prediction model. The results of a multivariate linear regression analysis, which includes the HWDI and age variables, yielded a BF% for men of – 0.159 (HWDI) + 0.161 (age) [adjusted [R.sup.2] = 0.215, standard error of estimate (SEE) = 5.37%, p < 0.001], and, for women, - 0.265 (HWDI) + 0.132 (Age) [adjusted [R.sup.2] = 0.337, SEE = 4.39%, p < 0.001] (see Table 2).
not, Pearson’s correlation coefficients was found to be lowest (roentgen = -0.20 for men and you will roentgen = -0.47 for ladies) when compared to previous knowledge you to utilized most other obesity investigations equipment having BF% [sixteen,18, 19]. In the 1996, Gallagher ainsi que al. learnt the connection anywhere between Bmi and you can BF% and you can stated beliefs out of roentgen = 0.58 for males and you may roentgen = 0.72 for ladies. Ilman et al. provides reported r = 0.85 for males and you can roentgen = 0.83 for ladies. For every single investigation discussed a definite BF% forecast model. It absolutely was before reported that, in addition to ages and you may gender, other variables for example nationality, ethnicity, and you may faith also may help improve the accuracy off an excellent BF% anticipate model [sixteen,19-23].