Delayed menarche in children and adolescents with type 1 diabetes mellitus: a systematic review and meta-analysis.

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Several studies have reported an association between age at menarche and the onset of type-1 diabetes mellitus (T1DM). This review compared the age at menarche in patients who had menarche after T1DM diagnosis with that of patients who were healthy and/or had menarche before T1DM diagnosis. Searches were conducted using four databases. The outcome was the age at menarche of patients who had menarche after T1DM diagnosis and patients who were healthy and/or had menarche before T1DM diagnosis. A qualitative analysis was performed using the JBI (Joanna Briggs Institute) Critical Appraisal. Quantitative analysis of the mean differences was performed using Revman 5.4 tool. A total of 1952 studies were obtained from the initial search. The final results were 13 articles that met the inclusion criteria for the qualitative assessment and eight for the quantitative assessment. Eight studies included 1030 patients who had menarche after being diagnosed with T1DM and 1282 patients who were healthy and/or had menarche before T1DM diagnosis. The meta-analysis showed a cumulative effect on a mean difference of 0.87 (95% CI: 0.75; 0.99, p-value < 0.00001), indicating a later age at menarche in patients who had menarche after T1DM diagnosis. The age at menarche was later in patients who had menarche after T1DM diagnosis compared to healthy subjects and those who had menarche beforehand.