Darker Skin Color Measured by Von Luschan Chromatic Scale and Increased Sunlight Exposure Time Are Independently Associated with Decreased Odds of Vitamin D Deficiency in Thai Ambulatory Patients
Table 1
Questionnaire for ascertainment of daily sunlight exposure time.
Day of week
6 am–8 am
8 am–10 am
10 am–12 pm
12 pm–2 pm
2 pm–4 pm
4 pm–6 pm
Question: In your usual clothes and on average, how many minutes are you exposed to sunlight during each specified period?