Diabetes and anti-diabetic interventions and the risk of gynaecological and obstetric morbidity: an umbrella review of the literature.

Fifty-five percent (26/47) of these effects were nominally significant at P < 0.05 and showed an increased risk.

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In addition to this, reporting bias by the authors of meta-analyses could have led to underreporting of associations that did not reach statistical significance or did not conform with general knowledge and expectations [ 90 , 91 ].

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