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Existing methods for analysis include joint modelling of the outcome and measurement processes, and inverse\u2010intensity weighting (IIW). This work extends previously proposed analysis of increments to the case of irregular follow\u2010up, yielding a model for the increments that can be used as a stand\u2010alone method. Furthermore, we propose two ways of combining the increments and IIW estimators. First, we use the increment model to select the truncation point for the inverse\u2010intensity weights that minimises the mean squared error of the IIW estimator. Second, we use the increment model to augment the usual IIW estimating equations to form a doubly robust estimator. We evaluate the methods through simulation and apply these to a recent study of juvenile dermatomyositis. 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