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. Author manuscript; available in PMC: 2020 Dec 1.
Published in final edited form as: Contemp Clin Trials. 2019 Oct 24;87:105854. doi: 10.1016/j.cct.2019.105854

Figure 2:

Figure 2:

Seasonal trend of weekly baseline (pre-randomization) total 25(OH)D (LC-MS/MS), Calcium and iPTH averages over the course of the study. Fitted curve was modeled as a linear function of sine and cosine terms with period of one year, adjusted for age, gender, race, BMI, smoking status, and latitude.

Based on a total of 7502 (25(OH)D), 7447 (Ca), and 7474 (iPTH) baseline measurements from subjects without non-randomized vitamin D or calcium supplements; red dots: weekly means based on 3 or less measurements.