Which of the following is a criterion for evaluating medical needs of inmates?

Evaluating the medical needs of inmates primarily focuses on their medical condition. This criterion is essential because it involves assessing any physical or mental health issues that may affect an inmate's well-being while incarcerated. Understanding an inmate's medical condition informs corrections staff about the necessary healthcare interventions, treatment plans, and medication management required to ensure the inmate's health is monitored and maintained throughout their time in custody.

The other options, while potentially relevant in other contexts of inmate management, do not directly impact the assessment of medical needs. Criminal history may inform security and risk assessments but not the specific medical care required. Disciplinary history may indicate behavioral patterns, while employment history might provide context about an inmate's background, but neither assesses the medical requirements essential for effective healthcare delivery. Therefore, focusing on the medical condition is crucial in determining how best to address inmates' health concerns.