Age at Menarche, Duration of Monthly Flow and Cycle Length as Risk Factors for Endometriosis | Stephy Publishers
Abstract
Introduction: Endometriosis is an enigmatic and multifaceted
ailment that distresses a large number of women worldwide which may trigger
pain, infertility and other discomforts such as dysmenorrhea.
Materials and Methods: Data from the medical records of 113 women
with and 113 age-matched women without endometriosis were analyzed
retrospectively to investigate association of three domains of menstrual
characteristics – age at menarche, duration of menstrual flow and cycle length –
with risk of developing endometriosis. STATA 13 statistical software was used
for analysis of data.
Results: Sub-fertile
women with menarche at <11 years were 1.80 times more likely to have
endometriosis (OR=1.80, 95% CI: 0.51, 6.33) and had 1.29 times the risk of
the disease (RR=1.29, 95% CI: 0.81, 2.06) influenced by body mass index (BMI in
Kg/m2). Women with duration of flow of 4-7 days were 2.33 times more likely to
have endometriosis. Women with cycle length of ≥28 days were 1.45 times more
likely to also have endometriosis. Mean egg yield at OPU from endometriotic
women was significantly lower than that from women without endometriosis when
age atmenarche was ≥14 years (t-test=-4.44, P-value=0.00000001), when duration
of flow (days) was 4-7 (t-test=-4.78, P-value=0.00000001) and when cycle length
was ≥28 days (t-test=-4.35, P-value=0.00000001). The mean matured eggs (MII)
was very significantly higher when age at menarche was ≥14 years (t-test=-2.59,
P-value=0.006), when duration of flow was 4-7 days (t-test=2.81, P-value=0.003)
and when the cycle length was ≥28 days (t-test=-2.79, P-value=0.003).
Multivariate regression analysis indicated that menarche, number of days of
menstrual flow and cycle length gave a significant 90% of the variation found
in endometriosis (R2=0.9001, F=648.77, P-value=0.000000001).
Conclusion: Menarche
at age <11 years and cycle length of ≥28 days were significantly associated
with and were better predictors of laparoscopic ally confirmed endometriosis.
BMI influenced all of the three domains of menarche, duration of flow (days)
and cycle length. Endometriotic women produced fewer oocytes but fertilization
rate was not compromised.
Keywords: Endometriosis,
Menstrual characteristics, Dysmenorrhea, Egg yield at ovum pick up (OPU), Sub-sahara
african women, Infertility
Abbreviations: APAHAC: african, pan-african health alliance and collaborative;
BMI: body mass index; CI: confidence interval; Coef: coefficient; MII: Eggs in
the second phase of meiosis and are mature; NFC: nordica fertility center; OPU:
ovum pickup; OR: odds ratio; PID: pelvic inflammatory disease; RR: risk ratio;
SSA: sub-sahara africa; Std Err: standard error; WHO: world health organization
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