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A model is proposed for continuous longitudinal data with non\u2010ignorable or informative missingness, taking into account the nature of attempts made to contact initial non\u2010responders. The model combines a non\u2010linear mixed model for the outcome model with logistic regression models for the reminder processes. A sensitivity analysis is used to contrast this model with the traditional selection model, where we adjust for missingness by modelling the missingness process.<\/jats:p><jats:p>The conclusions that recovery is slower, and less satisfactory with age and more rapid with below knee cast than with a tubular bandage do not alter materially across all models investigated. The results also suggest that phone calls are most effective in retrieving questionnaires. 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