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The association between parity and type 2 diabetes mellitus: a cross-sectional, community-based study
BMC Endocrine Disorders volume 24, Article number: 233 (2024)
Abstract
Background
Limited published data exist on the association between parity (number of deliveries) and diabetes mellitus (DM). This study was conducted to evaluate the association between parity and type 2 DM (T2DM) among Sudanese women.
Method
A multistage sampling survey was conducted in four villages in the River Nile State, Sudan, between July and September 2022. The World Health Organization’s three-level stepwise questionnaire was adopted to collect women’s sociodemographic characteristics (age, sex, height, weight, marital status, parity, education level, occupation, detailed obstetric history, and family history of T2DM). Multivariate analyses were performed.
Results
A total of 397 women were recruited. Their median (interquartile range) age was 45.0 (33.0‒55.7) years. A total of 154 women (38.8%) were nulliparous, whereas 93 (23.4%), 70 (17.6%), and 80 (20.2%) had para 1‒3, 4 or 5, and more than 5, respectively. A total of 112 (28.2%) women had T2DM. In multivariate analysis, older age (adjusted odds ratio, AOR, 1.04, 95%, confidence interval, CI, 1.02‒1.06), high parity (AOR, 1.1, 95% C, 1.01‒1.20), and a family history of DM (AOR, 3.26, 95% CI, 1.98‒5.38) were associated with T2DM. Compared with the nulliparity, para 1‒3 (AOR, 2.33; 95% CI, 1.17‒4.61), para 4 or 5 (AOR, 2.12; 95% CI, 1.04‒4.30), and para > 5 (AOR, 2.16; 95% CI, 1.09‒4.27) were at higher risk of T2DM. In women aged < 50 years, high parity (AOR, 1.22; 95% CI, 1.06‒1.44) was associated with T2DM. Compared with the nulliparous women, para 4 or 5 (AOR, 3.47; 95% CI, 1.16‒10.34) and para > 5 (AOR, 4.63; 95% CI, 1.54‒13.87) were associated with T2DM, whereas para 1‒3 was not associated with T2DM. In the women aged ≥ 50 years, parity and parity groups were not associated with T2DM.
Conclusion
There is a high prevalence of T2DM among Sudanese women. Parity and high parity are significant predictors of T2DM among these women in this part of Sudan.
Introduction
Diabetes mellitus (DM) is a chronic medical condition that affects 10.5% of the world’s population (537 million) aged 20–79 years, and it is expected to rise to 783 million (12.2%) by 2045 [1, 2]. Middle-income countries are expected to have the greatest relative increase in the prevalence of DM between 2021 and 2045 (21.1% ) [2]. The Middle East and North Africa (MENA) region had the highest prevalence of DM (18.1%) in people aged 20–79 years in 2021; low-income countries reported the highest proportion of undiagnosed DM (50.5%) [1]. Type 2 DM (T2DM) accounts for approximately 90% of all cases of DM and is a leading cause of long-term complications, such as cardiovascular disease, blindness, kidney failure, neuropathy, lower limb amputation, and cognitive diseases [1, 3]. Furthermore, DM-related mortality corresponds to 12.2% of global deaths from all causes in people aged 20–79 years, and the second highest region for mortality is the MENA region, with 20.2% of all deaths related to DM [1]. The financial burden of DM continues to rise, with the disease-causing at least USD 966 billion in health expenditures, a 316% increase over the last 15 years [1].
Pregnancy is associated with marked alterations in metabolic parameters, such as increased insulin resistance, hyperinsulinemia, and the accumulation and redistribution of body fat [4]. Previous studies have shown that high fasting plasma glucose levels [5] and elevated glycated hemoglobin [6] were associated with the number of live births. The data on the association between parity and T2DM remains inconclusive. While some studies have shown an association between parity and DM [5,6,7,8,9,10,11], others have reported no association between parity and DM [12,13,14] or parity was associated with reduced risk of DM [12].
The International Diabetes Federation (IDF) identified Sudan among countries that have a prevalence of DM of more than 12% and an estimated undiagnosed DM of less than 34% [1]. A community-based study showed that 20.8% of the adults in eastern Sudan had T2DM [15]. Moreover, a previous study in Northern Sudan has shown that females had a higher prevalence of T2DM (19.9%) compared with males (18.1%) [16]. High parity was reported among Sudanese women, as most of them had five deliveries or more (multiparity) at a younger age, before 35 years [17]. Given the importance of the two clinical entities and the limited published clinical data in Sudan, the MENA region, and Africa, the current study aims to investigate the influence of parity and high parity on the development of T2DM among Sudanese women.
Methods
This multistage sampling study recruited adult women from River Nile State, northern Sudan, during the period of July–September 2022. River Nile State, one of the 18 Sudanese states, has a population of 1,120,441 [18]. Almatamah, one of seven localities (the lowest administrative units in Sudan) in the River Nile state, was initially selected by simple random sampling. Adult women in households of four villages (i.e., Hajer Alteer, Athawra Kabota, Alkoumer, and Wadi Alshohda) were chosen randomly within the Almatamah locality based on the population size. The Strengthening the Reporting of Observational Studies in Epidemiology (STROBE) Statement standard checklists were adopted for the selection [19].
Inclusion and exclusion criteria
All the Sudanese women (> 18 years of age) from the selected household who agreed to participate were recruited for the study. Exclusion criteria included non-Sudanese nationalities, current pregnancy during the study, current use of contraceptive pills, current use of steroid medications for any medical problem, antiviral medication for chronic hepatitis infections, substance abuse, mental illness, disabilities, congenital deformities, and a competing chronic disease or malignancy. Further, those with known hemoglobinopathy (sickle cell disease, thalassemia, and glucose-6-phosphate dehydrogenase deficiency), patients with type 1 DM, severe anemia, renal failure, and liver failure, and those who refused to participate in the study were also excluded. Two general practitioners conducted interviews with the participants recruited for the study. Each participant signed informed consent after a proper explanation of their role and the aim of the study. A questionnaire was then used to collect the sociodemographic, clinical, and physical measurements, weight and height, family history and current history of DM, and blood pressure and glycated hemoglobin data. The World Health Organization’s (WHO) three-level stepwise questionnaire was adopted for data collection [20]. The questionnaire contained questions regarding the sociodemographic characteristics of the participants, including their age, marital status (married, widow, or divorced), education level (≤ secondary level or > secondary level); family history and medical history of DM, current history of hypertension, and drug history (steroid therapy). Moreover, a detailed history was obtained regarding their menopausal status, miscarriage, and the live birth/parity number. According to tradition, smoking and alcohol are not female’ habits; hence, we intentionally avoided including them in the questionnaire to encourage participants’ cooperation.
Definition of variables
Parity
Our main variable of interest was parity, which was obtained from the participants’ responses to the following question in the interview: “How many live births have you had?” The response was modeled as a categorical variable: nulliparous (0 births), 1–2 livebirths, 3–4 livebirths, and grand multiparity (≥ 5 live births).
Diabetes mellitus
A diagnosis of DM was considered for those who had documentation of T2DM and whether they were on diet control or glucose-lowering drugs during the study period or met the American Diabetes Association’s diagnosis of DM for nonpregnant adults and definition by the International Diabetes Federation [1, 21]. Random plasma glucose levels of ≥ 200 mg/dl (11.1 mmol/L) in patients with classic symptoms of hyperglycemia (polydipsia, polyuria, and polyphagia) or hyperglycaemic crisis or a glycated hemoglobin level of ≥ 6.5% were the primary diagnostic criterion.
Hypertension
Participants were diagnosed with hypertension and received treatment during the study period or fit the criteria for hypertension diagnosis based on blood pressure measurement, as described below.
Procedure for measuring blood pressure
An OMRON 3 (with an appropriate cuff size) automated blood pressure measuring device was used to obtain at least two blood pressure readings. Each participant was offered rest for at least 10 min before checking their blood pressure. The participant’s arms were adjusted to the level of their hearts. The mean of two blood pressure readings (at an interval of 1–2 min) was obtained and registered for each female. If there was a significant difference of more than 5 mmHg between the two readings, new measurements were recommended until a stable reading was obtained. The participants were considered hypertensive if systolic blood pressure ≥ 140 mmHg, diastolic blood pressure ≥ 90 mmHg, or both criteria were recorded in both of the repeated measurements [22].
Body mass index
Body mass index (BMI) was computed from the patient’s weight and height and classified based on the WHO classification for females: underweight (< 18.5 kg/m2), normal weight (18.5–24.9 kg/m2), overweight (25.0–29.9 (kg/m2), or obese (≥ 30.0 kg/m2) [23].
Sample size
The sample size of 397 women was calculated using the Open Epi Menu [24] with an assumption of a type I error of 5% and an adequate power of 80% (β = 0.2). The estimated sample size of 397 was calculated by assuming the prevalence of T2DM (30.0%). This assumption of the prevalence of T2DM was based on our previous observations in eastern Sudan [15]. Thus, a ratio of 2:1 was expected between women without T2DM and women with T2DM. We assumed that 35.5% of women with T2DM and 20.0% without T2DM would have parity ≥ 5. This assumption was based on a study that evaluated the multiparity and risk of DM [7].
Statistics
The Statistical Package for the Social Sciences (SPSS) for Windows (IBM SPSS v.25) was employed to analyze the data. The chi-square test was used to compare the proportions between women with T2DM and those without T2DM. Continuous data were evaluated for normality using the Shapiro–Wilk test. A t-test and Mann–Whitney test were performed to assess the normally distributed and non-normally distributed data between the two groups of women (T2DM and non-T2DM), respectively. Univariate binary analysis was conducted by entering the dependent (T2DM) and independent variables (age, BMI, education, occupation, family history of DM, past medical history of hypertension, and live birth/parity number). The independent variables with a univariate P value < 0.20 were entered into the model of multivariate binary analysis. Backward likelihood ratio adjustments were processed in the different models. AORs and 95% CIs were calculated, with P < 0.05 considered statistically significant.
Results
This study enrolled 397 women. Their median (interquartile range [IQR]) age was 45.0 (33.0‒55.7) years. The parity of these 397 women ranged from 0 to 10, with a median of 2. A total of 154 women (38.8%) were nulliparous, whereas 93 (23.4%), 70 (17.6%), and 80 (20.2%) had para 1‒3, 4 or 5, and more than 5, respectively. Of the 397 women, 267 (67.3%) had an educational level ≥ secondary education, and 218 (54.9%) were housewives. Age increased with parity, and women who had a para > 5 had the highest median (IQR) age (53.0 [42.0‒60.0] years). Of the 397 enrolled women, 124 (31.2%), 39 (9.8%), 120 (30.2%), and 114 (28.7%) were normal weight, underweight, overweight, and obese, respectively. The median (IQR) BMI of 27.6 (23.7‒32.9) kg/m2 was highest in women with para 4 or 5. A borderline correlation existed between age (r = 0.135), parity (r = 0.210), and BMI. A significantly higher number of housewives was found in women with para > 5. Educational level was not statistically different among women in the parity groups (Table 1).
A total of 112 (28.2%) women had T2DM, 45 (11.3%) women had known T2DM and 67 (16.9%) women had newly discovered T2DM. The prevalence of T2DM increased with parity and ranged from 18.2 to 38.8%. Women who had para > 5 had the highest prevalence (38.8%) of T2DM (Table 1; Fig. 1). In the univariate analysis, older age, high parity, a family history of DM, and a higher BMI were associated with T2DM. Educational level and occupation were not associated with T2DM (Table 2). However, after adjustment in the multivariate analysis, older age (AOR, 1.04, 95% CI, 1.02‒1.06), high parity (AOR, 1.1, 95% C, 1.01‒1.20), and a family history of DM (AOR, 3.26, 95% CI, 1.98‒5.38) were associated with T2DM. Moreover, we removed parity as a continuous variable from the model and entered the parity groups into the model. In this case, compared with the nulliparity, para 1‒3 (AOR, 2.33; 95% CI, 1.17‒4.61), para 4 or 5 (AOR, 2.12; 95% CI, 1.04‒4.30), and para > 5 (AOR, 2.16; 95% CI, 1.09‒4.27) were at higher risk of T2DM (Table 3). Thereafter, we divided the women into two age groups (≥ 50 and < 50 years). In women aged < 50 years, high parity (AOR, 1.22; 95% CI, 1.06‒1.44) was associated with T2DM. Compared with the nulliparous women, although para 4 or 5 (AOR, 3.47; 95% CI, 1.16‒10.34) and para > 5 (AOR, 4.63; 95% CI, 1.54‒13.87) were associated with T2DM, para 1‒3 was not associated with T2DM. In the women aged ≥ 50 years, parity and parity groups were not associated with T2DM (Table 3).
Discussion
The main finding of this study was that high parity was associated with T2DM (compared with the nulliparity, para 1‒3, para 4 or 5, and para > were at higher risk of T2DM). This is consistent with similar results of a population-based, prospective cohort study of 7,024 Caucasian and African-American women (45–64 years) with nine years of follow-up, which documented that grand multiparity (five or more live births) was associated with a higher prevalence of T2DM (44%) and predictive of future risk (27%) [6]. Another longitudinal cohort study of adult American women aged ≥ 65 years (3,211 participants) found that women with grand multiparity (≥ five live births) had a higher prevalence of T2DM (25.0%) at baseline compared with those with fewer births or nulliparous women [5]. Similarly, a prospective cohort study that evaluated a total of 25,021 Singaporean Chinese women aged 45–74 years for about 5.7 years of follow-up demonstrated a significant association between high parity, particularly for women who had five or more live births, and a higher risk of developing T2DM (74%) [11]. Further, a significant association was observed between grand multiparity (6 or more births) and increased prevalence of T2DM (10.3%) among postmenopausal Hispanic women compared to those with nulliparity [25], and 50.0% of Filipino American women had T2DM compared with low parity women [7]. Similarly, one study from China that recruited a total of 14,196 women (aged ≥ 45 years) showed a higher prevalence of T2DM (26.2%) and a significant association of a higher risk of T2DM among multiparous women (four or more live births) compared with women who had one live birth [10]. The results of two meta-analysis studies strengthened this. The first study (286,840 female participants) showed a linear relationship between high parity and the risk of T2DM, which increased by 42% [8]. The second study (296,923 participants) revealed that high parity (at least three live births) was associated with a significantly increased risk of T2DM (54%) [9]. Similarly, a Danish study (100669 participants) reported a T2DM rate of 3.69% among women with parity ≥ 4, and parity was associated with a significantly higher risk of T2DM compared with those with one child [26]. Further, Iranian women with parity ≥ 4 were shown to have more than 60% higher risk of developing T2DM compared to those with one parity during a median follow-up of 15.4 years (2552 participants, aged 30–65 years) [27]. A similar significant association between the risk of T2DM and parity was found among nulliparous women and those with 2 or ≥ 3 births compared to those with one birth in an observational cohort study that included 131,174 Chinese females aged ≥ 40 years [28].
In the current study, while in women aged < 50 years, high parity was associated with T2DM, in the women aged ≥ 50 years, parity and parity groups were not associated with T2DM. In a prospective cohort study (113,606 participants, aged 30 to 55 years) among United States registered nurses with follow-up for 12 years, parity was not found to be associated with a significantly increased risk of subsequent clinical T2DM among women with six or more births compared with nulliparous women [13]. This was strengthened by the non-significance association among women with parity ≥ 4 children and age-matched low-parity women (1 and 2 children) in terms of insulin resistance and β-pancreatic cell function [14]. Moreover, high parity was associated with higher fasting insulin levels and reduced insulin sensitivity, which increases the risk of subsequent clinical insulin resistance [29]. This indicates that reproductive-age hires have a higher risk for developing T2DM compared to post-menopausal women, as pregnancy is associated with milder degrees of dysglycemia [30]. This may be linked to weight retention and increased insulin resistance associated with pregnancy [31]. Additionally, pregnancy is associated with reduced physical activity and some cardiometabolic changes (weight gain and dyslipidemia) that can exacerbate insulin resistance [31]. Moreover, repeated pregnancy is considered another contributing factor [32]. Reproductive age increases the chance of using contraceptive methods, in particular, pills for family planning; long-term use of contraceptive methods is associated with a significant risk of T2DM among this age group [33]. This higher prevalence of T2DM, associated with higher parity compared to nulliparity, may reflect the influence of parity as a significant risk factor for developing T2DM.
On the other hand, previous studies showed that parity was not associated with an increased risk of subsequent DM [13, 14]. Moreover, there were no differences observed in insulin sensitivity or insulin secretion among women with high parity when compared with age-matched and BMI-matched women in a lower parity group [14]. On the other hand, data from a population-based study that recruited 383 females (aged 12–79 years) in a Native Canadian community documented an association between parity and a significantly reduced risk of T2DM (nulliparous vs. ≥1 birth) [12].
The outcomes of these studies must be compared cautiously with our results. It is obvious that there were discrepancies in the methods adopted in these studies, and there were modeling differences. While some studies compared women with high parity (≥ 5 births) to low-to-moderate parity and nulliparous as references, other studies did not include nulliparous women in the studies as references. Moreover, different cutoffs of age or range of participants were chosen for each study. The difference in lifestyle, cultural, and genetic influences and the difference in the prevalence of T2DM may influence the results of these studies, which were conducted in different populations [34]. Women with a certain genetic heritage exhibit insulin resistance during pregnancy, a phenomenon also reflected in the occurrence of polycystic ovarian syndrome, gestational diabetes, and/or T2DM, as more than 250 loci are linked with T2DM [35]. Compared with nulliparity, metabolic syndrome was significantly associated with parity, and for each increment of one live birth, the risk of metabolic syndrome was positively and directly related [36]. In addition, more women are overweight or obese after the age of 45, indicating the influence of aging [37]. The diagnosis of metabolic syndrome is associated with a potential risk of hyperglycaemia and developing T2DM among this group of subjects [36]. The significant association of T2DM among women over 50 years of age may be explained by aging, as it is associated with central obesity, which is responsible for insulin resistance and future T2DM [38]. Further, reduced muscle tissue (30–40%) favoring adipose tissue, reduced physical activity, and usage of potentially diabetogenic medications, such as diuretics, beta-adrenolytics, corticosteroids, and psychotropic medications [39]. Moreover, the sensitivity of pancreatic β cells for incretins declines with aging, leading to lower postprandial insulin levels weaker suppression of glucagon secretion [40], and growing insulin resistance with increased age [41]. Further, low estrogen after the menopausal period negatively affects body fat distribution, and fat accumulation is an important contributor to T2DM risk [42]. Moreover, evidence suggests that the female hormone, 17β-oestradiol protects insulin production and prevents T2DM because it acts primarily via two distinct estrogen receptors, alpha (ERα) and beta (ERβ ): while ERα promotes β-cell survival, ERβ reduces ERα function and enhances β-cell apoptosis [42]. Alterations in cytokines during pregnancy are a potential pathophysiological mechanism behind the increase in insulin resistance, as white adipose tissue and the placenta represent endocrine organs, secreting adipokines, and cytokines, including tumor necrosis alpha (TNF-α) factor, leptin, adiponectin, and interleukin-6 (IL-6) [43]. Some new biomarkers were linked with sexual dimorphisms, such as the hepatocyte fetuin-A [44], and high levels of copeptin (the C-terminal portion of the precursor of vasopressin) were associated with a significant risk of future T2DM in women but not in males [45]. Likewise, exosomes (membrane-derived nanovesicles) secreted from both the placenta and adipose tissue may have an effect throughout gestation, mediating a placental response to hyperglycemia and insulin sensitivity [46]. This is supported by the higher levels of exosomes observed in women with gestational DM compared to normal pregnancies across gestation [47].
This study has certain limitations that should be considered. The reproductive history of the subjects was self-reported, which may lead to misclassification of parity, gravidity gestational DM, and use of oral contraceptives, particularly among older women. Further, self-reporting of menopausal status may be associated with some misclassification, and some other risk factors were not assessed, such as salt intake, diet, physical exercise, oral contraceptive use, smoking, alcohol consumption, and lipid profile.
Conclusion
The prevalence of T2DM among Sudanese women was found to be significantly high, with parity and the number of live births being significant predictors of T2DM among adult Sudanese females.
Data availability
The datasets generated and/or analyzed during the current study are not publicly available (because the manuscript is still under the peer review process) but are available from the corresponding author on a reasonable request.
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The authors would like to thank all the participants who participated in this study.
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IRM and IA conceived the study; IRM, OEO, and IA supervised the work, guided the analysis and critically reviewed the manuscript; OEO, and IA prepared the analysis plan, performed the data analysis and wrote the first draft of the manuscript. All authors reviewed and approved the final manuscript.
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This study complies with the Declaration of Helsinki. The Ethics Committee of the Health Authority in Almatamah, Sudan, provided ethical approval of the study (reference number # 03/2021). A signed written informed consent was collected from each participant.
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Musa, I.R., Osman, O.E. & Adam, I. The association between parity and type 2 diabetes mellitus: a cross-sectional, community-based study. BMC Endocr Disord 24, 233 (2024). https://doiorg.publicaciones.saludcastillayleon.es/10.1186/s12902-024-01767-2
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DOI: https://doiorg.publicaciones.saludcastillayleon.es/10.1186/s12902-024-01767-2