Skip to main content
×
×
Home

An Investigation Into the Position in Family of Mental Defectives: Prepared for the Mental Deficiency Sub-Committee of the Research and Clinical Committee of the Royal Medico-Psychological Association

  • F. Douglas Turner (a1) and Lionel S. Penrose (a1)
Extract

This investigation was undertaken at the instance of the Mental Deficiency Sub-committee of the Research and Clinical Committee of the Association. It is an attempt to answer the question whether or not the order in which a mentally defective child is born into a family can have any influence as a cause of the mental defect.

Copyright
References
Hide All

* Karl Pearson, On the Handicapping of the First-Born, 1914. G. F. Still, “On Place-in-family as a Factor in Disease,” Lancet, October, 1927, pp. 795 and 853.

* Neil A. Dayton, “Order of Birth and Size of Family,” Amer. Journ. of Psychiat., 5929, viii, p. 979.

* Annual Report of L.C.C., 1912 and 1925.

In a given table, if (N1) be the number of only children, and (N2) the number of cases in families of 2 and (N3) the number of cases in families of 3, and so on, then the expectation of the number of first-born children is etc., and the expectation of the number of second-born is etc., and so on. For example, in Table II the values of N1, N2, etc., are given by the totals in the last line. Thus the expectation of first-born is— and the expectation of fifth-born is—

* Vol. iii, p. 191.

* Cf. M. T. MackIm, Amer. Journ. Med. Sci., 1929.

* The ages of the parents in ioo cases of non-mongolian defectives taken at random from the questionnaire papers were as follows: in the group of mongols the coefficient of correlation between the ages of mother and father was P68, and in the non-mongol group it was .69.

* Report of Research and Clinical Committee of the Royal Medico-Psychological Association, July, 5930.

Op. cit.

* Feeble Mindedness: Its Causes and Consequences, 1916.

e.g., H. S. Jennings, The Biological Basis of Human Nature, 1930.

* Let the size of the fraternity be n members and the expected proportion of affected members in all such fraternities be ¼. Assuming that the affected members are distributed at random in these fraternities, and that only those families come under observation which contain at least one affected member, the percentage of affected members in the observed families is given by the formula— A rough value for the expectation is obtained by putting the average size of the family for n. In this case n = 4.26.

The deviation of the observed proportion of affected persons from the expected value is 6.1% which is more than four times the mean quadratic error of the expected value, 1.4%.

Recommend this journal

Email your librarian or administrator to recommend adding this journal to your organisation's collection.

The British Journal of Psychiatry
  • ISSN: -
  • EISSN: 2514-9946
  • URL: /core/journals/the-british-journal-of-psychiatry
Please enter your name
Please enter a valid email address
Who would you like to send this to? *
×

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 3 *
Loading metrics...

Abstract views

Total abstract views: 7 *
Loading metrics...

* Views captured on Cambridge Core between 19th February 2018 - 20th June 2018. This data will be updated every 24 hours.

An Investigation Into the Position in Family of Mental Defectives: Prepared for the Mental Deficiency Sub-Committee of the Research and Clinical Committee of the Royal Medico-Psychological Association

  • F. Douglas Turner (a1) and Lionel S. Penrose (a1)
Submit a response

eLetters

No eLetters have been published for this article.

×

Reply to: Submit a response


Your details


Conflicting interests

Do you have any conflicting interests? *