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Observed and estimated mean scores for an immortal cohort (with single imputation). The figure displays the observed and estimated mean scores for arm A (upper panel) and arm B (lower panel) when considering an immortal cohort. Single imputation has been applied. The black solid-line curve corresponds to the arithmetic average of the observed score values, the blue dotted-line curve corresponds to the IPW method, and the green dash-dotted-line curve corresponds to the LI method.
