Which of the following signs or symptoms is more common in children than adults following head trauma?

Nausea and vomiting are particularly common in children following head trauma due to their developing nervous systems and anatomical differences. In pediatric patients, there is often less space within the skull and a greater propensity for increased intracranial pressure after an injury. This can stimulate the brain's vomiting center, leading to nausea and vomiting more frequently than in adults.

Children also tend to have a different response to head injuries compared to adults, with symptoms manifesting differently. While nausea and vomiting can occur in both age groups, the incidence is notably higher in children due to their unique physiology and the effects of head trauma on their developing brains.

In contrast, altered mental status, tachycardia and diaphoresis, and changes in pupillary reaction can occur in both children and adults, but they do not show the same increased prevalence in children as nausea and vomiting do in relation to head trauma. Therefore, nausea and vomiting stand out as the more prevalent symptoms in pediatric patients after such injuries.