## 3 Results  
In total, 826 people responded to a questionnaire; of these, 254 were women who identified themselves as having a non-Western ethnic background. For the majority of these women, Denmark was the place of birth (162 or 64%); also, for the majority of the women, their mothers (248 or 98%) and fathers (248 or 98%) were born in other places than Denmark, mainly Turkey and Somalia (Supplementary Material 1). The median age (IQR) of these women was 26 (23-33) years old; 81 (32%) had a professional bachelor's, 71 (28%) had high school, and 56 (22%) had a master's or a higher university degree. The majority were full-time employed (80 or 32%) and students with work (79 or 31%); 93 (37%) used headwear (Table 1).  
The respondents scored highest on the general vitamin D knowledge, with the median (IQR) being 85 (75-90) on the scale of 0 to 100; vitamin D nutrition knowledge, attitudes, and behavior scored lower, but on average above the middle of the scale (Table 2).  
Women's age was associated with vitamin D attitudes (\(p\) = 0.019) and behaviors (\(p\) = 0.022); younger women scored higher on vitamin D attitudes, and older women scored higher on vitamin D behaviors (Figures 1 and 2). [PERSON]'s test revealed that those in the age groups 19-25 years and 26-35 years had significantly lower scores on vitamin D attitudes than those in the age group of 19-25 years; those in age group 19-25 years had a tendency toward lower scores on vitamin D behaviors than those in the age group of 46-60 years (Supplementary Material 2).  
\begin{table}
\begin{tabular}{c c c c} \hline \hline
**Characteristics** & **Variables** & **N** & **\%** \\ \hline \multirow{6}{*}{Age} & 0–18 years old & 10 & 4 \\  & 19–25 years old & 118 & 46 \\  & 26–35 years old & 71 & 28 \\  & 36–45 years old & 41 & 16 \\  & 46–60 years old & 14 & 5 \\ \hline \multirow{6}{*}{Education} & Vocational & 10 & 4 \\  & High school & 71 & 28 \\  & Bachelor’s general & 19 & 7 \\  & Bachelor’s professional & 81 & 32 \\  & Master’s and higher & 56 & 22 \\  & Other & 17 & 7 \\ \hline \multirow{6}{*}{Employment} & Full time & 80 & 31 \\  & Part time & 19 & 7 \\  & Retired & 1 & 0 \\  & Student & 60 & 24 \\  & Student with work & 79 & 31 \\  & Home wife & 8 & 3 \\  & Other & 7 & 3 \\ \hline \multirow{6}{*}{Headwear} & Yes & 93 & 37 \\  & No & 157 & 62 \\  & Other & 4 & 2 \\ \hline \multirow{2}{*}{Place of birth} & Denmark & 162 & 64 \\  & Other & 92 & 36 \\ \hline \multirow{2}{*}{Mother’s place of birth} & Denmark & 6 & 2 \\  & Other & 248 & 98 \\ \hline \multirow{2}{*}{Father’s place of birth} & Denmark & 5 & 2 \\  & Other & 247 & 97 \\ \cline{1-1}  & Don’t know & 1 & 0 \\ \hline \hline \end{tabular}
\end{table}
Table 1: Sociodemographic characteristics of the respondents.  
\begin{table}
\begin{tabular}{c c c c} \hline \hline
**Outcome** & **N** & **Median (IQR)** & **Mean (SD)** \\ \hline Vitamin D general knowledge & 254 & 85 (75–90) & 82.8 (12.23) \\ Vitamin D nutrition knowledge & 254 & 60 (40–80) & 60.6 (22.68) \\ Vitamin D attitudes & 243 & 60 (54–64) & 59.4 (7.48) \\ Vitamin D behaviors & 238 & 60 (54–64) & 59.3 (8.27) \\ \hline \hline \end{tabular}
\end{table}
Table 2: Scores for vitamin D knowledge, attitudes, and behaviors.  
Education was associated with vitamin D nutrition knowledge (\(p=0.014\)): women with high school education had significantly lower scores on knowledge about vitamin D nutrition compared to those with a professional bachelor's education (Figure 3, Supplementary Material 3). There were no differences in vitamin D knowledge, attitudes, and behaviors between women with different employment statuses.  
Figure 1: Scores for vitamin D attitudes in age groups (\(p=0.019\), ANOVA).  
Figure 2: Scores for vitamin D behaviors in age groups (\(p=0.022\), ANOVA).