Maternal albumin-adjusted serum calcium (A) and urine calcium:creatinine ratio (B), at baseline, day 14 and delivery. Specimens were collected at baseline, 14 days after enrolment (for urine ca:cr) and at delivery. Kernel density plots, boxplots and jittered scatterplots illustrate the distribution of each subgroup. Upper and lower bounds of the box illustrate the 25th and 75th percentiles, and the black horizontal line within the box represents the median. (A) The black horizontal line within the scatterplot represents the mean; (B) black horizontal line within the scatterplot represents the square of the mean of square root-transformed ca:cr.
Roth et al. Nutrition Journal 2013 12:47 doi:10.1186/1475-2891-12-47