Table 4.
Factors associated with vitamin D status in the studied population: Iranian children aged 9–18 years, Fars Province, autumn and winter of 2011
| Factor | P value of univariate analysis | P and adjusted r 2 value of multiple regression analysis* |
|---|---|---|
| BMI | 0·02 | P=0·06, r 2=0·35 |
| Tanner stage | 0·04 | P=0·006, r 2=0·35 |
| Sun exposure | 0·04 | P=0·03, r 2=0·35 |
| Fat mass index | 0·03 | P=0·14, r 2=0·32 |
| Lean mass index | 0·861 | – |
| Sex | 0·3 | – |
| Age | 0·16 | P=0·008, r 2=0·35 |
| Physical activity | 0·082 | P=0·001, r 2=0·35 |
*
All factors with P<0·2 in univariate analysis were included in multiple regression analysis (mode: Enter).