A Prospective, Community-Based Evaluation of Liver Enzymes in
Individuals With Hepatitis C After Drug Use
Fig. 2. Mean ALT values in selected Baltimore
populations. Blood donors are HCV (-), HIV (-), hepatitis B virus
surface antigen (-), and are from the Baltimore area. The reference
population represents patient samples sent to a Baltimore reference
laboratory for routine health screening of asymptomatic patients.
Error bars represent 95% confidence intervals, which could not be
calculated for the reference population.

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