Final answer:
The prevalence of Seasonal Affective Disorder (SAD) in Iceland compared to New Hampshire cannot be determined without specific data, as it depends on various factors including sunlight exposure, genetic predisposition, and vitamin D levels.
Step-by-step explanation:
The statement that Iceland has fewer cases of Seasonal Affective Disorder (SAD) than New Hampshire, despite New Hampshire receiving more sunlight, requires a more nuanced understanding. SAD is a type of depression that typically occurs during the darker months of the year when there is less exposure to sunlight. Factors contributing to SAD include not only exposure to sunlight but also genetic predisposition, vitamin D deficiency, and levels of melanin in the skin which can affect vitamin D absorption.
Research suggests that SAD may be linked to a deficiency in vitamin D and it is more common in individuals with darker skin pigmentation. This might offer some insight into the prevalence of SAD in different populations, regardless of the actual sunlight exposure they receive. With this context, it's difficult to make a general statement about the incidence of SAD in Iceland compared to New Hampshire without specific epidemiological data.