Diabetes Care, Vol 21, Issue 3 346-349, Copyright © 1998 by American Diabetes Association
The relationship of menstrual irregularity to type 2 diabetes in Pima Indian women
J Roumain, MA Charles, MP de Courten, RL Hanson, TD Brodie, DJ Pettitt and WC Knowler
Diabetes and Arthritis Epidemiology, Phoenix Epidemiology and Clinical Research Branch, National Institute of Diabetes and Digestive and Kidney Disease, AZ 85014 USA. janine_roumain@nih.gov
OBJECTIVE: Menstrual irregularity is associated with hyperinsulinemia and
hyperandrogenemia in nondiabetic Pima Indian women of child-bearing age. In
this population-based study, we determined the relationship of menstrual
irregularity to type 2 diabetes in Pima Indian women. RESEARCH DESIGN AND
METHODS: Participants for this cross-sectional analysis were 695
nonpregnant Pima Indian women, aged 18-44 years, involved in an ongoing
epidemiologic study of diabetes among residents of the Gila River Indian
Community of Arizona. Clinical data were collected by questionnaire and an
examination that included a 75-g oral glucose tolerance test; diabetes was
diagnosed by World Health Organization criteria. Menstrual irregularity was
defined as an interval of 3 months or more between menses, when not
pregnant, since age 18 years. RESULTS: History of menstrual irregularity
was significantly associated with a high prevalence of diabetes (37 vs.
13%; odds ratio = 4.2, 95% CI = 1.6-10.8) in the least obese women (BMI
< 30 kg/m2), adjusted for the effects of age and overall obesity. This
association was, in part, because of greater central obesity in women with
irregular menses. In more obese women, there was little association with
menstrual irregularity, and diabetes was frequent regardless of menstrual
history. CONCLUSIONS: Prevalence of type 2 diabetes is higher among Pima
indian women with a history of menstrual irregularity. The difference is
most pronounced among the least obese group of women. This association may
be because of insulin resistance and hyperinsulinemia, which predict type 2
diabetes, also causing hyperandrogenism and menstrual irregularity. The
findings reinforce the need to evaluate women with menstrual irregularity
for hyperglycemia.