Hypothetical cumulative incidence curves for SCC in NAS and SLH. Observed actuarial cumulative incidence curves for SCC (step functions) and spline-smoothed estimates (smooth curves); shaded regions show 95% point-wise confidence intervals. Curves in NAS and SLH indicate the cumulative incidence of SCC expected if the competing risks of non-SCC death could be removed and the hazard of development of SCC remained unchanged.