Insufficient use of menopausal hormone therapy in Swedish women with early or premature menopause caused by bilateral oophorectomy: a register-based study.

OBJECTIVE: To investigate the use of menopausal hormone therapy (MHT) in premenopausal women after bilateral oophorectomy. DESIGN: Retrospective register-based cohort study. SETTING: Sweden. POPULATION: Swedish women aged 35-44 years without malignancy who underwent bilateral oophorectomy in 2005-2020 were identified using The Swedish National Quality Register of Gynaecological Surgery (GynOp). METHODS: Data from GynOp were cross-linked with data on dispensed drugs extracted from the Swedish Prescribed Drug Register. MAIN OUTCOME MEASURES: Proportion of women dispensed MHT at least once within 1 year after surgery. Repeated treatment episodes were defined, and the proportion of 'person time' covered by dispensations was analysed. RESULTS: In total, 1231 of all women (n = 1706) were dispensed MHT at some point after surgery, with 1177 women dispensed MHT within 1 year. This proportion increased from 64% in 2005 to 84% in 2019 (p < 0.001). In the total population, 4537 'treatment years' transpired, corresponding to 43% of the mean time covered. In women dispensed MHT within 1 year, the proportion of time covered was 63%. CONCLUSIONS: Only 69% of all women without malignancy of any kind who underwent bilateral oophorectomy were dispensed MHT within 1 year after surgery, and the duration of treatment was limited. It is important to study further the reasons behind the low dispensation rate in this group to increase adherence to current treatment guidelines, improve quality of life, and avoid increased morbidity and mortality.

Prevalence of high-risk HPV and cervical dysplasia in IUD users and controls: a cross sectional study.

OBJECTIVE: To examine the prevalence of infections with high-risk human papillomavirus (HPV) and cervical dysplasia, and the clearance rate of HPV infections, in users of different kinds of intrauterine devices (IUDs) and other contraceptive methods. METHODS: A cross-sectional register-based study including 16,181 women aged 30-49 years participating in the screening programme for cervical cancer in a Swedish County in 2017-2018. Data on contraception from screening records was paired with the HPV test results, cytological and histological follow-up tests and subsequent HPV test. RESULTS: There was no difference in the risk of being HPV positive, or histological HSIL+, between users of copper-containing IUDs and women with no reported use of contraception. Use of levonorgestrel intrauterine system and hormonal contraception were associated with higher odds for HPV infection in age-adjusted models (aOR 1.21; 95% CI 1.04-1.41, and aOR 1.41; 95% CI 1.22-1.63, respectively) and for HSIL+ (aOR 1.45; 95% CI 1.02-2.06, and aOR 1.56; 95% CI 1.13-2.16, respectively). No significant differences were found in HPV clearance rates. CONCLUSIONS: Reported use of levonorgestrel intrauterine system and hormonal contraception, but not use of copper IUD, was associated with a higher prevalence of HPV infections and histological HSIL + compared to no reported use of contraception.

Women using copper IUD showed no difference in prevalence of HPV or cervical dysplasia compared to women not using contraception in cross-sectional study.

Fecal incontinence and associated pelvic floor dysfunction during and one year after the first pregnancy.

INTRODUCTION: Obstetric anal sphincter injury is an important risk factor for postpartum fecal incontinence but few studies have reported fecal incontinence occurring, even during pregnancy. The first objective of this study was to examine the prevalence of fecal incontinence, obstructed defecation and vaginal bulging early and late in pregnancy and postpartum. The second objective was to assess the association between symptoms in pregnancy, delivery characteristics, and bowel and vaginal bulging symptoms at 1 year postpartum. MATERIAL AND METHODS: This prospective cohort study was conducted between October 2014 and October 2017, including 898 nulliparous women enrolled with the maternity healthcare service in Örebro County, Sweden. The women responded to questionnaires regarding pelvic floor dysfunction in early and late pregnancy and at 8 weeks and 1 year postpartum. The data were analyzed using random effect logistic models estimating odds ratios (ORs) and generalized linear models estimating relative risks, with 95% confidence intervals (CIs). RESULTS: At 1 year postpartum, the prevalence of fecal incontinence, obstructed defecation and vaginal bulging was 6% (40/694), 28% (197/699) and 8% (56/695), respectively. Among women with vaginal delivery, the risk of fecal incontinence and vaginal bulging increased significantly both in late pregnancy, with ORs of 3.4 (95% CI 1.5-7.7) and 3.6 (95% CI 1.6-8.1), respectively, and at 1 year postpartum, with ORs of 5.0 (95% CI 2.1-11.5) and 8.3 (95% CI 3.8-18.1), respectively, compared with early pregnancy. Among all women, factors associated with increased prevalence of fecal incontinence 1 year postpartum were fecal incontinence during pregnancy (adjusted relative risk [aRR] 7.4; 95% CI 4.1-13.3), obstructed defecation during pregnancy (aRR 2.0; 95% CI 1.1-3.9) and concurrent obstructed defecation (aRR 2.4; 95% CI 1.3-4.5). CONCLUSIONS: This prospective study shows an increased risk of fecal incontinence by late pregnancy, suggesting that the pregnancy itself may be involved in the development of postpartum fecal incontinence. Obstructed defecation during pregnancy and postpartum was found to be associated with increased risk of fecal incontinence postpartum, indicating that postpartum fecal incontinence may be a result of incomplete bowel emptying.

Differential effects of estradiol and progesterone on human T cell activation in vitro.

Estradiol (E2) and progesterone (P4) are steroid hormones important for the regulation of immune responses during pregnancy. Their increasing levels coincide with an improvement of T cell-mediated diseases such as multiple sclerosis (MS). Although immune-endocrine interactions are involved in this phenomenon, the relative contribution of hormones is not known. We here report a direct comparison of E2- and P4-mediated effects on human CD4+ T cells, key cells in immune regulation. T cells were stimulated to obtain different activation levels and exposed to a broad range of hormone concentrations. Activation level was assessed by CD69/CD25 expression by flow cytometry, and secreted proteins (n = 196) were measured in culture supernatants using proximity extension assay and electrochemiluminescence immunoassay. We found that in low activated cells, pregnancy-relevant E2 concentrations increased activation and the secretion of several immune- and inflammation-related proteins. P4, on the other hand, showed a biphasic pattern, where serum-related concentrations upregulated activation and protein secretion while placenta-relevant concentrations induced a prominent dampening irrespective of the initial activation level. Our results demonstrate the importance of P4 as a major hormone in the immune modulation of T cells during pregnancy and emphasize the need to further evaluate its potency in the treatment of diseases like MS.

Effectiveness, safety and overall satisfaction of early postpartum placement of hormonal IUD compared with standard procedure: An open-label, randomized, multicenter study.

INTRODUCTION: In this open-label, randomized controlled, non-inferiority, multicenter study we aimed to study the risk of termination of pregnancy within 1 year postpartum, the safety profile and patient acceptability after early postpartum insertion of a hormonal intrauterine device (LNG-IUS, Mirena®) compared with standard placement 6-8 weeks postpartum. MATERIAL AND METHODS: April 2018 to January 2020 women with uncomplicated vaginal delivery at four urban birth centers in Sweden, were randomized to either early placement within 48 h after delivery (early group) or standard placement 6-8 weeks postpartum (standard group) of a hormonal intrauterine device. The main outcome measure was the proportion of terminations of pregnancies in each group during the first year after placement of the intrauterine device. Registration EudraCT database no. 2017-001945-29. RESULTS: The study was prematurely stopped according to the protocol due to an expulsion rate >20% in the early group. No pregnancies occurred. Fifty-two women were randomized to early and 49 women to standard insertion. In the early group, 23/52 (44.2%) of the intrauterine devices were expelled. After expulsion, 10 women chose to have another hormonal intrauterine device placed but still significantly fewer women (39/52, 75%, p = 0.22) in the early group used the hormonal intrauterine device method at study completion. No expulsions occurred in the standard group, but 5/49 (10.2%) requested removal and 41/49 (83.7%, p = 0.22) had used the hormonal intrauterine device method continuously for 1 year. CONCLUSIONS: Early hormonal intrauterine device insertion after vaginal delivery is associated with high expulsion rates. Despite this, a high continuation rate of the hormonal intrauterine device method is seen among women once choosing the method. In the light of high continuation rates, the advantages of early insertion could balance the risk of expulsion for well-informed women.

Examining the pace of change in contraceptive practices in abortion services - a follow-up case study of a quality improvement collaborative.

BACKGROUND: Among all women who experienced an abortion in Sweden 2017, 45% had previously underwent at least one abortion. This phenomenon of increasing rates of repeat abortions stimulated efforts to improve contraceptive services through a Quality Improvement Collaborative (QIC) with user involvement. The participating teams had difficulty in coordinating access post-abortion to the most effective contraception, Long-acting reversible contraception (LARC), during the eight-month QIC. This prompted questions about the pace of change in contraceptive services post-abortion. The aim of the study is to evaluate the evolution and impact of QIC changes regarding patient outcomes, system performance and professional development over 12 months after a QIC designed to enhance contraceptive services in the context of abortion. METHODS: This follow-up case study involves three multi-professional teams from abortion services at three hospitals in Sweden, which participated in a QIC during 2017. We integrated qualitative data on the evolution of changes and quantitative data regarding the monthly proportion of women initiating LARC, analysed in statistical control charts from before the QIC up until 12 months after its conclusion. RESULTS: Teams A and B increased the average proportion of women who initiated LARC within 30 days post abortion in the 12 months after the QIC; Team A 16-25%; Team B 20-34%. Team C achieved more than 50% in individual months but not consistently in the Post-QIC period. Elusive during the QIC, they now could offer timely appointments for women to initiate LARC more frequently. Team members reported continued focus on how to create trustful relationships when counseling women. They described improved teamwork, leadership support and impact on organizing appointments for initiating LARC following the QIC. CONCLUSIONS: QIC teams further improved women's timely access to LARC post abortion through continued changes in services 12 months after the QIC, demonstrating that the 8-month QIC was too short for all changes to materialize. Teams simultaneously improved women's reproductive health, health services, and professional development.

Risk of abortion within 1-2 years after childbirth in relation to contraceptive choice: a retrospective cohort study.

Objectives: The primary objective of the study was to investigate whether the choice of long-acting reversible contraception (LARC) was associated with the risk of abortion over a period of 24 months postpartum. The secondary objective was to analyse whether other significant factors were affecting the risk of abortion during this period.Methods: In this retrospective cohort study, we analysed 11,066 women who had delivered in three Swedish cities during 2013 and 2014. Demographic and medical variables were obtained from medical records. Attendance at the postpartum visit, choice of postpartum contraception and history of abortion was noted. Logistic regression analysis was performed to assess factors associated with the risk of abortion. The main outcome measure was the proportion of women with abortion up to 24 months postpartum.Results: Data from 11,066 women were included in the final analysis. Within 12-24 months after delivery 2.5% of women had an abortion. The choice of LARC after childbirth reduced the risk of subsequent abortion (odds ratio 0.74; 95% confidence interval [CI] 0.60, 0.91; p =  .005). Smoking, age <25 years and have had a previous abortion significantly increased the risk of abortion during follow-up, whereas exclusive breastfeeding decreased the risk.Conclusions: Increasing the proportion of women who choose LARC postpartum could decrease the risk of abortion for up to 2 years after childbirth.

Sexual function changes attributed to hormonal contraception use - a qualitative study of women experiencing negative effects.

Objective: To increase the understanding of women who experience negative effects on sexual function when using hormonal contraception.Methods: We performed 24 in-depth interviews with women who had previously experienced negative sexual function effects while using hormonal contraceptives. The thematic analysis method was used.Results: 'After experience comes insight', 'Lubrication and desire go hand in hand', 'Mental wellbeing comes before desire' and 'The contraceptive counsellor potentially facilitates insight and decision-making' were the main themes found in the study.Conclusions: This selected group of women described lubrication difficulties and decreased sexual desire associated with both contraceptive use and the menstrual cycle. Contraceptive use became easier with age and with better understanding. The contraceptive counsellor could facilitate the process. Further choice between hormonal or non-hormonal contraceptive methods depended primarily on experienced adverse effects on mood, and secondarily on sexual function, weighed against the advantages or disadvantages experienced during the person's own menstrual cycle.

Patterns of prescription and discontinuation of contraceptives for Swedish women with obesity and normal-weight women.

Purpose: This study aimed to explore the prescription of different contraceptive methods to Swedish women with obesity and to compare the pattern of prescription and adherence to treatment between this group and normal-weight women. Materials and methods: This study included 371 women with obesity and 744 matched normal-weight women, aged 18-40. Medical records were scrutinised for the period 1 January 2010 to 31 December 2014. The retrieved variables included: background characteristics, prescribed contraceptive methods, adverse effects, duration of treatment, reason for discontinuation and bleeding pattern. Result: Progestin-only pills were mainly prescribed to women with obesity (44% vs. 20%, p = 0.001) whereas combined hormonal contraception was mainly prescribed to normal-weight women (60% vs. 21%, p < 0.0001). Thirty-three percent vs. 25% (p = 0.003) discontinued their contraceptive method within 1 year. The most commonly declared reason for discontinuation was bleeding disturbance (14.7% vs. 9.6%, p = 0.008). Conclusion: The most commonly prescribed contraceptive method in women with obesity was progestin-only pills, but surprisingly many women with obesity were prescribed combined hormonal contraception despite current Swedish and European guidelines. Incident users with obesity were significantly more likely to discontinue their contraceptive method within the first year of the study period, compared with incident normal-weight users.

Postpartum infection in relation to maternal characteristics, obstetric interventions and complications.

The purpose was to evaluate the association between maternal characteristics, obstetrical interventions/complications and postpartum wound infections (WI), urinary tract infection (UTI) and endometritis. Furthermore, this study aimed to determine the time from delivery to onset of infections after discharge from the hospital. Three large Swedish Medical Health Registers were scrutinized for the period 2005-2012. A total of 582,576 women had 795,072 deliveries. Women with diagnosis codes for WIs, UTIs or endometritis, from delivery to 8 weeks postpartum, were compared to non-infected women. Adjusted odds ratios (OR) and 95% confidence intervals (CI) were estimated. Increasing age and body mass index (BMI) were both associated with increasing prevalence of postpartum infections. WIs were most strongly associated with cesarean section (CS) (OR 17.2; 95%CI 16.1-18.3), 3rd and 4th degree tears (OR 10.7%; 95%CI 9.80-11.9) and episiotomy (OR 10.2; 95%CI 8.94-11.5). Endometritis was associated with anemia (OR 3.16; 95%CI 3.01-3.31) and manual placental removal (OR 2.72; 95%CI 2.51-2.95). UTI was associated with emergency CS (OR 3.46; 95%CI 3.07-3.89) and instrumental delivery (OR 3.70; 95%CI 3.29-4.16). For women discharged from the delivery hospital the peak occurrence of UTI was 6 days postpartum, while for WIs and endometritis it was 7 days postpartum.

Ongoing or previous mental disorders predispose to adverse mood reporting during combined oral contraceptive use.

PURPOSE: Previous studies have emphasised that women with pre-existing mood disorders are more inclined to discontinue hormonal contraceptive use. However, few studies have examined the effects of combined oral contraceptives (COC) on mood in women with previous or ongoing mental disorders. MATERIALS AND METHODS: This is a supplementary analysis of an investigator-initiated, double-blinded, randomised clinical trial during which 202 women were treated with either a COC (1.5 mg estradiol and 2.5 mg nomegestrolacetate) or placebo during three treatment cycles. The Mini International Neuropsychiatric Interview was used to collect information on previous or ongoing mental disorders. The primary outcome measure was the total change score in five mood symptoms on the Daily Record of Severity of Problems (DRSP) scale in the intermenstrual phase of the treatment cycle. RESULTS: Women with ongoing or previous mood, anxiety or eating disorders allocated to COC had higher total DRSP Δ-scores during the intermenstrual phase of the treatment cycle in comparison with corresponding women randomised to placebo, mean difference 1.3 (95% CI 0.3-2.3). In contrast, among women without mental health problems, no difference in total DRSP Δ-scores between COC- and placebo users was noted. Women with a risk use of alcohol who were randomised to the COC had higher total DRSP Δ-scores than women randomised to placebo, mean difference 2.1 (CI 95% 1.0-3.2). CONCLUSIONS: Women with ongoing or previous mental disorders or risk use of alcohol have greater risk of COC-induced mood symptoms. This may be worth noting during family planning and contraceptive counselling.

Contraceptive counselling of women seeking abortion - a qualitative interview study of health professionals' experiences.

OBJECTIVES: A substantial proportion of women who undergo an abortion continue afterwards without switching to more effective contraceptive use. Many subsequently have repeat unintended pregnancies. This study, therefore, aimed to identify and describe health professionals experiences of providing contraceptive counselling to women seeking an abortion. METHODS: We interviewed 21 health professionals (HPs), involved in contraceptive counselling of women seeking abortion at three differently sized hospitals in Sweden. The interviews were recorded and transcribed verbatim and analysed using conventional qualitative content analysis. RESULTS: Three clusters were identified: 'Complex counselling', 'Elements of counselling' and 'Finding a method'. HPs often experienced consultations including contraceptive counselling at the time of an abortion as complex, covering both pregnancy termination and contraceptive counselling. Women with vulnerabilities placed even greater demands on the HPs providing counselling. The HPs varied in their approaches when providing contraceptive counselling but also in their knowledge about certain contraception methods. HPs described challenges in finding out if women had found an effective method and in the practicalities of arranging intrauterine device (IUD) insertion post-abortion, when a woman asked for this method. CONCLUSIONS: HPs found it challenging to provide contraceptive counselling at the time of an abortion and to arrange access to IUDs post-abortion. There is a need to improve their counselling, their skills and their knowledge to prevent repeat unintended pregnancies.

Likelihood of repeat abortion in a Swedish cohort according to the choice of post-abortion contraception: a longitudinal study.

INTRODUCTION: Despite high access to contraceptive services, 42% of the women who seek an abortion in Sweden have a history of previous abortion(s). The reasons for this high repeat abortion rate remain obscure. The objective of this study was to study the choice of contraceptive method after abortion and related odds of repeat abortions within 3-4 years. MATERIAL AND METHODS: This is a retrospective cohort study based on a medical record review at three hospitals in Sweden. We included 987 women who had an abortion during 2009. We reviewed medical records from the date of the index abortion until the end of 2012 to establish the choice of contraception following the index abortion and the occurrence of repeat abortions. We calculated odds ratios (OR) with 95% CI. RESULTS: While 46% of the women chose oral contraceptives, 34% chose long-acting reversible contraceptives (LARC). LARC was chosen more commonly by women with a previous pregnancy, childbirth and/or abortion. During the follow-up period, 24% of the study population requested one or more repeat abortion(s). Choosing LARC at the time of the index abortion was associated with fewer repeat abortions compared with choosing oral contraceptives (13% vs. 26%, OR 0.36; 95% CI 0.24-0.52). Subdermal implant was as effective as intrauterine device in preventing repeat abortions beyond 3 years. CONCLUSIONS: Choosing LARC was associated with fewer repeat abortions over more than 3 years of follow up.

Hormonal contraception and sexual desire: A questionnaire-based study of young Swedish women.

OBJECTIVES: The aim of the study was to determine whether a decrease in sexual desire is more prevalent among women using hormonal contraception than among women using hormone-free contraception, and whether a decrease increases the risk of changing to another contraceptive method. METHODS: A validated questionnaire was posted to 3740 women (aged 22, 25 or 28 years) living in Sweden. Descriptive statistics were used to present the results; differences between groups were tested using χ(2) analyses. A multiple logistic regression model was used for analysis of possible confounders. RESULTS: The response rate was 50%. The majority (81%) of respondents used some kind of contraception, and 88% were generally satisfied with the method used. Regardless of the type of method, 27% of hormonal contraceptive users reported a decrease in sexual desire that they attributed to their use of hormonal contraception, whereas only 12% of women using hormone-free contraception reported a decrease in sexual desire (p<0.01). This twofold risk of a decrease in sexual desire was shown in the multiple regression analysis to be independent of age group, depression, BMI, educational level and parity. However, having a partner was found to be a factor of equal importance: women with partners experienced reduced desire twice as often as women without partners. The observed odds ratio for planning to stop hormonal contraception or to change to a different type due to reduced desire was 8.16 (95% confidence interval 6.65-10.1) among women who had had the same experience during a previous period of hormonal contraceptive use. CONCLUSIONS: Women using hormonal contraception were more likely to experience reduced sexual desire compared with women using hormone-free contraception. Experiencing reduced desire was a strong predictive factor for women to change contraceptive method.

'Organisation of contraceptive care' and attitudes among healthcare providers in two Swedish cities with different socio-demographic profiles.

OBJECTIVE To compare contraceptive services provided by family planning clinics in Linköping and Norrköping in Östergötland County, Sweden. The two cities are of similar size but have different socio-demographic profiles. The abortion rate in Linköping (15.3 per 1000) is substantially lower than in Norrköping (21.1 per 1000). METHODS The study was performed in two steps. First, the clinics providing contraceptive services in the two cities were studied using ten pre-defined quality indicators. Thereafter, 11 healthcare providers were interviewed: six in Linköping and five in Norrköping. The interviews were analysed using qualitative content analysis. RESULTS No differences were found in the organisation of contraceptive care in the two cities. Neither city met the criteria for five of the ten quality indicators. The analysis of the interviews generated four themes: 'Guidelines and electronic record template', 'Criteria for good contraceptive counselling', 'Availability of contraception', and 'Sexual health'. The interviews revealed that the clinical leadership in Norrköping was insufficient. CONCLUSION Clinics in the two cities are organised in the same way so that differences in abortion rates cannot be related to differences in organisation. The reasons for the differences in abortion rates in the two cities have yet to be determined.

Women's experiences of postpartum contraceptive services when elective caesarean section is the method of birth: a qualitative study.

BACKGROUND: The unmet need for postpartum contraception is a global challenge. Postpartum placement of an intrauterine device (IUD) within 48 hours of vaginal delivery is available in many settings worldwide, but is not routinely practised in Sweden. To improve contraceptive services and facilitate the informed choice of IUD placement at the time of a caesarean section (CS), we performed this study to identify and describe women's experiences of contraceptive services before, during and after an elective CS. METHODS: A qualitative design and methodology was used. We interviewed 20 women aged 28-42 years who underwent elective CS in Sweden. Interviews were analysed using reflexive thematic analysis. RESULTS: The three main themes found were (1) receptivity to contraceptive counselling in the context of CS, (2) communication and decision-making about postpartum contraception before CS and (3) lack of support and guidance to receive contraceptive services before and after CS. The participants described readiness and interest regarding postpartum contraception. They prefered counselling from around 25 weeks of gestation. Despite this finding, antenatal communication and contraceptive decision-making seemed rare. Participants reported a lack of support and guidance which necessitated a need by women to navigate the contraceptive services themselves in order to receive information about contraception before CS and to receive postpartum support. CONCLUSIONS: Antenatal contraceptive counselling including information about IUD placement during CS was appreciated and welcomed by women with elective CS as their birth method. Most of the women whom we interviewed would prefer to receive contraception counselling on postpartum use during the second half of their pregnancy.

Leptin and adiponectin in cord blood from children of normal weight, overweight and obese mothers.

AIM: To study cord blood concentrations of adiponectin and leptin in children born by normal weight, overweight and obese mothers and to study these parameters in relation to a weight gain intervention programme for obese mothers. METHODS: Ten millilitre cord blood was collected and analysed for leptin and adiponectin concentrations in children with gestational age >37 weeks born by 60 normal weight, 45 overweight and 145 obese mothers. 82 obese mothers took part in a weight gain intervention programme. RESULTS: Concentrations of leptin and adiponectin were higher in cord blood from children of overweight and obese mothers compared with children of normal weight mothers (leptin: Md 13.2, 30, 3 and 90.2 ng/mL respectively, p < 0.001; adiponectin 35.9, 205.4, 213.8 ng/L p < 0.001). No differences were found between overweight and obese mothers. The weight gain intervention programme for obese pregnant women had significant effects on the weight gain during pregnancy but had no effects on cord blood serum concentrations of leptin and adiponectin. CONCLUSION: Cord blood leptin and adiponectin concentrations were higher in children born by overweight or obese women compared with children of normal weight mothers. A weight gain intervention programme for obese pregnant women did not affect these results. Intrauterine exposition to high concentrations of leptin and adiponectin may play a role in weight development later in life.

Maternal obesity and the risk of postpartum infections according to mode of delivery.

OBJECTIVE: The aim of the present study was to assess the impact of different maternal Body Mass Index (BMI) classes on the risk of postpartum endometritis, wound infection, and breast abscess after different modes of delivery. Secondly to estimate how the risk of postpartum infection varies with different maternal BMI groups after induction of labor and after obstetric anal sphincter injuries. METHODS: A population-based observational study including women who gave birth during eight years (N = 841,780). Data were collected from three Swedish Medical Health Registers, the Swedish Medical Birth Register, the Swedish National Patient Register, and the Swedish Prescribed Drug Register. Outcomes were defined by ICD-10 codes given within eight weeks postpartum. The reference population was uninfected women. Odds ratios were determined using Mantel-Haenszel technique. Year of delivery, maternal age, parity and smoking in early pregnancy were considered as confounders. RESULTS: There was a dose-dependent relationship between an increasing maternal BMI and a higher risk for postpartum infections. Women in obesity class II and III had an increased risk for endometritis after normal vaginal delivery aOR 1.45 (95% CI: 1.29-1.63) and for wound infections after cesarean section aOR 3.83 (95% CI: 3.39-4.32). There was no difference in how maternal BMI affected the association between cesarean section and wound infection, regardless of whether it was planned or emergent. Women in obesity class II and III had a lower risk of breast abscess compared with normal-weight women, aOR 0.47 (95% CI: 0.38-0.58). The risk of endometritis after labor induction decreased with increasing maternal BMI. The risk of wound infection among women with an obstetrical sphincter injury decreased with increasing BMI. CONCLUSION: This study provides new knowledge about the impact of maternal BMI on the risk of postpartum infections after different modes of delivery. There was no difference in how BMI affected the association between cesarean section and wound infections, regardless of whether it was a planned cesarean section or an emergency cesarean section.