Male proportion in offspring of military air pilots in Norway
DOI:
https://doi.org/10.5324/nje.v9i1.442Abstract
ABSTRACT
Rumours of a reduced male proportion in offspring of fathers occupied as military air pilots were
confirmed in two American studies in 1961 and 1987, but not in a German study in 1976. Data of the
Medical Birth Registry of Norway were used to assess whether offspring of fathers occupied as military air
pilots, had a deviant sex-ratio.
Method.
Results.
Conclusion.
N
ORSK SAMMENDRAG
Rykter om redusert andel sønner av fedre ansatt som flyvere i forsvaret, ble støttet i to amerikansk studier
fra 1961 og 1987, men ikke i en tysk studie fra 1976. Data fra Medisinsk fødselsregister ble brukt til å
undersøke om fødte, etter 16. svangerskapsuke, med fedre som flyvere i forsvaret i Norge, hadde en skjev
kjønnsratio.
Metode.
Resultat.
Konklusjon.
Andel sønner til mannlige flyvere i forsvaret var signifikant redusert. Gruppen er imidlertid
liten og resultatet bør bekreftes av andre studier.
Flyvere i forsvaret var fedre til 65 barn. Andelen av gutter var 36,9%, i referansepopulasjon varandelen 51,4% med en relativ risiko 0,72 (95% CI 0,57–0,92).
Studien var basert på alle fødte i Norge 1970–1993 med tilgjengelig folketellings-informasjon(ca. 1,2 millioner). Kohorten av flyvere ble etablert ut fra opplysninger om yrke og utdannelse i folketellingene
fra 1970, 1980 og 1990. Referansepopulasjonen var alle resterende barn.
Male proportion in offspring of men occupied as military air pilots was significantly reduced.However, the group is small and the result needs to be confirmed in other studies.
Men working as military air pilots had 65 infants. The male proportion was 36.9%, the maleproportion in the reference population was 51.4% with a relative risk 0.72 (95% CI 0.57–0.92).
The study was based on all births in Norway 1970–1993 for which linkage with populationcensus data could be obtained (about 1.2 million). Fathers’ occupation was derived from census data of
1970, 1980 and 1990 on job title and education. The reference population was the group that did not belong
to the occupation under study.
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