Health trajectories are descriptions (usually in terms of lines or curves) of how a person’s health changes as they get older. They are estimated from growth curve models with health as the outcome. Growth curve models analyse outcomes that have been repeatedly measured over a period of time, in order to describe and quantify changes in that outcome over the time period. Growth curve models are usually fitted in using latent variable methods or with multilevel methods. Both methods give similar results, although the substantive question may result in preferring one method over another.
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