One 2008 review has proposed the following categories for hypovitaminosis D:
2.
Hypovitaminosis D is linked to the development and severity of depression
3.
The resulting hypovitaminosis D is usually due to a partial combination of both factors.
4.
This can be caused by conditions such as hypoparathyroidism and hypovitaminosis D or even decreased hormonal production in the elderly.
5.
Risk factors for hypovitaminosis D include premature birth, darker skin pigmentation, obesity, malabsorption, and older age.
6.
Hypovitaminosis D is described as any deficiency of vitamin D . A vitamin D blood concentration standard for diagnosing hypovitaminosis D does not exist.
7.
Hypovitaminosis D is described as any deficiency of vitamin D . A vitamin D blood concentration standard for diagnosing hypovitaminosis D does not exist.
8.
Megaloblastic anemia not due to hypovitaminosis may be caused by antimetabolites that poison DNA production directly, such as some chemotherapeutic or antimicrobial agents ( for example azathioprine or trimethoprim ).
9.
Some evidence suggests hypovitaminosis D may be associated with a worse outcome for some cancers, but evidence is insufficient to recommend that vitamin D be prescribed for people with cancer.
10.
Contrastingly, an animal with ocular hypovitaminosis-A will suffer from degeneration of the optic nerve, affecting both reflexes, and such an animal presents with a lack of both reflexes.