Lefthandedness (was: rubric help another one)
Posted: Tue Jan 06, 2004 8:19 am
Dear all,
there may also be a definite reason why nowadays more people are
considered left-handed:
Prenatal sonography!
---------------------
Epidemiology 2001 Nov;12(6):618-23
Comment in:
Epidemiology. 2001 Nov;12(6):601.
Epidemiology. 2002 May;13(3):370.
Sinistrality--a side-effect of prenatal sonography: a comparative study
of young
men.
Kieler H, Cnattingius S, Haglund B, Palmgren J, Axelsson O.
Department of Women's and Children's Health, Obstetrics and Gynecology,
Uppsala
University, Sweden.
Although ultrasound during pregnancy is used extensively, there is
little
published on adverse fetal effects. We undertook a cohort study
including men
born in Sweden from 1973 to 1978 who enrolled for military service. We
estimated
relative risks for being born left-handed according to ultrasound
exposure in
fetal life using logistic regression analysis. Eligible for the study
were 6,858
men born at a hospital that included ultrasound scanning in standard
antenatal
care (exposed) and 172,537 men born in hospitals without ultrasound
scanning
programs (unexposed). During the introduction phase (1973 to 1975) there
was no
difference in left-handedness between ultrasound exposed and unexposed
(odds
ratio = 1.03, 95% confidence interval (CI) = 0.91 to 1.17). When
ultrasonography
was offered more widely (1976 to 1978), the risk of left-handedness was
higher
among those exposed to ultrasound compared with those unexposed (odds
ratio =
1.32, 95% CI = 1.16 to 1.51). We conclude that ultrasound exposure in
fetal life
increases the risk of left-handedness in men, suggesting that prenatal
ultrasound affects the fetal brain.
---------------------------------------
Something to take into account, also in homoeopathic case-taking.
(But: the lefthandedness is not necessarily a symptom that needs to be
included).
Best,
Gaby
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Gaby Rottler
Germany
rottler@curantur.de
http://www.curantur.de
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
there may also be a definite reason why nowadays more people are
considered left-handed:
Prenatal sonography!
---------------------
Epidemiology 2001 Nov;12(6):618-23
Comment in:
Epidemiology. 2001 Nov;12(6):601.
Epidemiology. 2002 May;13(3):370.
Sinistrality--a side-effect of prenatal sonography: a comparative study
of young
men.
Kieler H, Cnattingius S, Haglund B, Palmgren J, Axelsson O.
Department of Women's and Children's Health, Obstetrics and Gynecology,
Uppsala
University, Sweden.
Although ultrasound during pregnancy is used extensively, there is
little
published on adverse fetal effects. We undertook a cohort study
including men
born in Sweden from 1973 to 1978 who enrolled for military service. We
estimated
relative risks for being born left-handed according to ultrasound
exposure in
fetal life using logistic regression analysis. Eligible for the study
were 6,858
men born at a hospital that included ultrasound scanning in standard
antenatal
care (exposed) and 172,537 men born in hospitals without ultrasound
scanning
programs (unexposed). During the introduction phase (1973 to 1975) there
was no
difference in left-handedness between ultrasound exposed and unexposed
(odds
ratio = 1.03, 95% confidence interval (CI) = 0.91 to 1.17). When
ultrasonography
was offered more widely (1976 to 1978), the risk of left-handedness was
higher
among those exposed to ultrasound compared with those unexposed (odds
ratio =
1.32, 95% CI = 1.16 to 1.51). We conclude that ultrasound exposure in
fetal life
increases the risk of left-handedness in men, suggesting that prenatal
ultrasound affects the fetal brain.
---------------------------------------
Something to take into account, also in homoeopathic case-taking.
(But: the lefthandedness is not necessarily a symptom that needs to be
included).
Best,
Gaby
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Gaby Rottler
Germany
rottler@curantur.de
http://www.curantur.de
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
