Which statement about otosclerosis is true?

Otosclerosis is a condition that primarily affects the bones of the middle ear, particularly the stapes, leading to conductive hearing loss. The correct statement regarding the demographic most affected by otosclerosis is that it occurs most often in white populations. Epidemiological studies have shown that otosclerosis is more prevalent in Caucasians compared to other racial and ethnic groups, providing evidence for this distinction.

The condition itself can lead to varying degrees of hearing impairment, and while conductive hearing loss is the most common result, in some cases, it can also lead to mixed hearing loss if there is an additional sensorineural component due to changes in the inner ear. However, the typical presentation involves primarily conductive mechanisms.

The other statements inaccurately represent the nature of otosclerosis, either by suggesting a sole occurrence in specific types of hearing loss or misrepresenting demographic prevalence.