Comparative annual hazard rates by age in NAS and SLH. (A) Annual hazard rates of SCC in NAS and SLH, by age, and 95% confidence envelopes (shaded regions). (B) Annual hazard rates of non-SCC death in NAS and SLH, by age, and 95% confidence envelopes. Comparative SLH hazard rates in (A) and (B) were derived using data from patients who survived beyond the 6-month landmark.