[decimon]

...risk may be greater for locations occurring earlier in residential histories.

The meaning is obscure to me. The link didn't help.

[neverdem]

...risk may be greater for locations occurring earlier in residential histories.

"The meaning is obscure to me. The link didn't help."

Sunlight deprivation and consequent vitamin D deficiency might be more easily explained by getting a complete history of where a person lived, not just where they are currently living.