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Original Article

A circadian variation in the observed duration of labor

Pages 465-468 | Received 14 Dec 1990, Accepted 25 Jun 1991, Published online: 03 Aug 2009

References

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  • Glattre E, Bjerkedal T. The 24-hour rhythmicity of birth. Acta Obstet Gynecol Scand 1983; 62: 31–36
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  • Pecaud F, Martin-Beran B, Gutzwiller F. Hour of birth as a prognostic factor for perinatal death. Lancet 1988; i: 340–3
  • Bergsjø P, Bakketeig L S, Bjerkedal T. Fødselsregistrering med partogram (Birth registration by partogram [in Norwegian, English summary]). Tidsskr Nor Laegeforen 1977; 95: 439–42
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  • Armitage P. Statistical methods in medical research. Blackwell Scientific Publications, Oxford 1974
  • Bergsjø P, Bakketeig L, Eikhorn S N. Duration of labor with spontaneous onset. Acta Obstet Gynecol Scand 1979; 58: 129–34
  • Nesheim B I. Duration of labor. An analysis of influencing factors. Acta Obstet Gynecol Scand 1988; 67: 121–4

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