Fig. 1
From: Vitamin D levels and deficiency with different occupations: a systematic review
25-hydroxyvitamin D (25-(OH)D) levels in different occupational groups. Data represent the weighted means pooled from the means of the included studies obtained for each occupational category. Error bars represent pooled standard error of means computed as \( SEp= Sp\sqrt{\frac{1}{n_1}+\frac{1}{n_2}} \), where Sp is pooled variance, n1 represents sample size of group 1, and n2 represents sample size of group 2