title: Multiple sclerosis and birth order.
abstract: Studies on the birth order of patients with multiple sclerosis have yielded contradictory conclusions. Most of the sets of data, however, have been tested by biased tests. Data that have been submitted to unbiased tests seem to suggest that cases are more likely to occur in early birth ranks. This should be tested on further samples and some comments are offered on how this should be done.
mesh_terms: D001722:Birth Order; D006801:Humans; D009103:Multiple Sclerosis / Q000209:etiology*