Ordinal Position, Family Size, and Diagnosis in a Psychiatric Hospital Population Page: 11
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in two separate tudiic«i investigated some ©f the antecedent
factor# in tl @ family histories of schisophrenic patients.
Originally (13), he studied 391 schisophrenic patients at a
state hospital, and tabulated his findings as shown belowt
BIRTH ORDER ASO PER CENT OP
Placement P«r Cent of
Ordinal • ••••••••••••••••••«« 24
Ultimate . 23
Penultimate • •••«••••• 16
Solitary • ••«•• 11
Other • •••••••••••••. •••••• 25
He had no norsis or comparison group in this study, but
he did feel that these data supported the hypothesis that
differing birth order was a significant factor in the etiology
of schizophrenia, with the youngest child being somewhat over-
He also found that the average siase of the family from
which these patients came consisted of 4*1 children as
compared to the national average of 2*1 children per family,
counting only those families with children*
In his later and more thorough study, Vahl (14) collected
data on 568 male schisophrenics in the United States Navy.
In this study he used as a comparison group 100,000 naval
inductees. The ratio of the birth order statistics between
the schisophrenics and controls wast
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Sensenig, John. Ordinal Position, Family Size, and Diagnosis in a Psychiatric Hospital Population, thesis, August 1963; Denton, Texas. (https://digital.library.unt.edu/ark:/67531/metadc108247/m1/15/: accessed April 19, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; .