Two types of intrauterine devices (IUDs) are currently available in the United States: the levonorgestrel-releasing intrauterine system and intrauterine copper contraceptive. Both are highly effective and provide long-term protection against unintended pregnancy.1 Moreover, they are cost-effective with savings surpassing $7 for every $1 spent in services and supplies.2,3 These devices were once considered too risky for teenagers, but several organizations,4–6 including the Centers for Disease Control, have recently published guidelines stating they are safe to use in women younger than 20 years of age.6
Despite this, IUD use among 15–24 year olds has failed to keep pace with that of women older than age 24 years.7 This may be due to of the reluctance of U.S. health care providers to prescribe this contraceptive to teenagers or nulliparous women as a result of lingering concerns about the risk of pelvic inflammatory disease associated with earlier devices. For example, in a California study of 816 clinicians, only 46% considered IUDs appropriate for nulliparous women and only 39% endorsed it for teenagers.8 In addition, only 19% of obstetrician–gynecologists surveyed in a 2010 study stated that they would offer an IUD to an unmarried 17 year old who had never been pregnant.9
To address these concerns, information about continuation and complications associated with IUDs currently available among teenage girls is needed. However, according to two Cochrane Reviews, few studies have been published on this topic.10,11 Furthermore, those that have been published found conflicting results. One secondary data analysis reported that 85% of teenagers who had a levonorgestrel-releasing intrauterine system inserted continued its use for 12 months or more (n=179).12 However, this study may not be applicable to the general population because 19% of participants had an intellectual disability. A randomized study of U.S. adolescents using copper IUDs and levonorgestrel-releasing intrauterine systems also found favorable continuation rates among 14–18 year olds but was limited by a small sample size (n=23).13 In contrast, a 2012 publication on 136 mothers up to 22 years of age reported a continuation rate of only 55% after 12 months and higher pregnancy rates than expected with both devices (6.2% and 3.7% for copper IUDs and levonorgestrel-releasing intrauterine systems, respectively).14 Similarly, another study of 89 women 16–22 years of age noted a mean duration of use less than 12 months.15 In addition to their relatively small sample sizes, all four of these studies were limited by a lack of comparison to women from other age groups. Thus, they cannot be used to accurately assess if continuation or complication rates within a population are the same or higher among teenagers compared with women in their early 20s or those 25 years of age or older.
The purpose of this study was to examine the frequency of complications, failure, and discontinuation within the first year among a national sample of women 15–19 years of age who had an IUD inserted between 2002 and 2009 as compared with 20–24 and 25–44 year olds. Differences in complications and continuation between the levonorgestrel-releasing intrauterine system and copper IUD were also estimated.
MATERIALS AND METHODS
This retrospective cohort study used electronic health insurance claims made between 2002 and 2010 from enrollees in a commercially available nationwide U.S. health insurance program. The entire data set contains information on more than 45 million individuals, of which approximately 80% purchase their health insurance through their employer and have at least one medical claim recorded. The deidentified data set does not contain any information about participants' socioeconomic status, race, or ethnicity.16 Data for this data set are collected from records of claims paid by the insurance company based on submissions from health care providers across the United States. Studies using this data set have appeared in prominent journals.17–19 Geographic and gender information is available and is similar in distribution to the U.S. population. However, it has been estimated that more whites, young, and middle-aged adults are included in the data set than the overall U.S. population. This study was exempted from full review by the University of Texas Medical Branch institutional review board.
First, we identified 156,727 women 15–44 years of age with a claim for an IUD insertion between 2002 and 2009. This was done by identifying those with a health care common procedure code for insertion (levonorgestrel-releasing intrauterine system=J7302, S4989, S4981; copper IUD=J7300) and a Current Procedural Terminology (CPT) code (58300) or International Classification of Diseases, 9th Revision, Clinical Modification (ICD-9-CM) code (69.7, V25.1, V25.42, V25.11) for insertion on the same date. Of these, 90,489 had 12 months or more of continuous insurance coverage after IUD insertion. A total of 69 of the 90,489 women had codes for intellectual disabilities or autism (ICD-9-CM codes 042, 043, 044, 279.0, 279.1, 279.2, 279.3, 795.71, V08). These women were not excluded from the study as a result of their very low number. Of the total sample, 19,904 received a copper IUD and 70,585 received a levonorgestrel-releasing intrauterine system. In this sample, 96% were commercial payers and the remainder had Medicaid.
Data on age, year of insertion, type of health care provider who inserted the IUD, and whether it was inserted after delivery of a neonate was obtained from the database. To determine age, the year of birth was subtracted from the year of IUD insertion. The exact date of birth was not available, so year of birth served as a proxy. Age ranges (15–44 years old) and categories (15–19, 20–24, and 25–44 years old) were chosen based on methods from other national studies that examined birth control methods among women by age group.20,21 Health care provider specialties were categorized as obstetricians–gynecologists, pediatricians, family practitioner or internal medicine or general practitioners, clinics, and nonphysician providers, or specialists. A postpartum insertion was defined as one that occurred 8 weeks or less after a normal delivery.
Claims for complications that could be associated with IUD use occurring within 12 months of insertion were examined. For women who discontinued IUD use within 12 months, complications that occurred between insertion and discontinuation were evaluated. Outcomes included pain associated with female genital organs (dyspareunia, dysmenorrheal, or premenstrual tension syndrome), disorders of menstruation (absence of menstruation, scanty or infrequent menstruation, excessive or frequent menstruation, irregular menstrual cycles, metrorrhagia, postcoital bleeding, dysfunctional or functional uterine hemorrhage, or unspecified), inflammation or infection (inflammatory diseases of the ovary, fallopian tube, pelvic cellular tissue, and peritoneum; inflammatory disease of the uterus except the cervix as well as cervicitis and endocervicitis), uterine perforation, and mechanical complications of IUDs. In addition, the frequency of a normal intrauterine pregnancy and abnormal pregnancy that occurred between IUD insertion and discontinuation was examined (ectopic pregnancy, molar pregnancy, abnormal products of conception, missed abortion, spontaneous abortion; ICD-9-CM codes included in table footnotes).
Intrauterine device discontinuation within 12 months of insertion was determined by the presence of an ICD-9-CM or CPT code that indicated IUD removal (ICD-9-CM codes: 97.71, V25.12, V25.13; CPT codes: 58301, 58562). The relationship between IUD discontinuation and complications experienced in the last 30 days was also examined.
Descriptive statistics were used to describe the distributions of patient age and health care provider specialty by type of IUD inserted and to evaluate the frequencies of complications, failure, and discontinuation within 1 year of IUD insertion or within 30 days of a claim for a complication or failure by age group. The ratio of levonorgestrel-releasing intrauterine system to copper IUD insertion was examined across time. Univariable logistic regression models were used to estimate the associations of the type of IUD inserted (levonorgestrel-releasing intrauterine system compared with copper IUD placement) with age, year of insertion, and physician specialty. Multivariate logistic regression models were used to evaluate 1) the effects of age, type of IUD, and their interaction on outcomes (complications, discontinuation, and failure); 2) the effects of age group with teenagers being the group of interest and the other two groups acting as the referents; and 3) the association of complications and pregnancy with discontinuation. All multivariate logistic regression models controlled for age at insertion, IUD type, health care provider type, and year of IUD insertion. All statistical analyses were done using SAS 9.2 (SAS Institute, Cary, NC).
The levonorgestrel-releasing intrauterine system was inserted more often than the copper IUD in women of all ages (Table 1). Women 15–19 years of age who requested an IUD were 1.4 times more likely than those 25–44 years old to receive the levonorgestrel-releasing intrauterine system rather than a copper IUD. Gynecologists inserted 91% of all IUDs. All health care providers were more likely to insert a levonorgestrel-releasing intrauterine system than a copper IUD.
Between 2002 and 2009, there was an increase in the frequency of IUD use among women of all three age groups. In 2002, only 3,200 women had an IUD inserted. Of these, 1.5% were 15–19 years old, 11.7% were 20–24 years old, and 86.8% were 25–44 years old. By 2009, the total number increased to 21,727, with 2.7% among 15–19 year olds, 11.7% in 20–24 year olds, and 86.3% in 25–44 year olds.
Levonorgestrel-releasing intrauterine system insertions increased more than copper IUD insertions among women in all three age groups from 2002 to 2009 (Fig. 1). In 2002, approximately the same number of each type was inserted. Within 3 years, the levonorgestrel-releasing intrauterine system was being inserted twice as often as the copper IUD in all three age groups. By 2009, the levonorgestrel-releasing intrauterine system was being inserted five, seven, and eight times for every copper IUD in the 25- to 44-, 20- to 24-, and 15- to 19-year age groups, respectively. Younger women (15–19 and 20–24 year olds) were more likely to have their IUD inserted after delivery of a neonate as compared with those 25–44 years of age (odds ratio [OR] 1.76, confidence interval [CI] 1.54–1.97 and OR 1.63, CI 1.54–1.72, respectively).
The frequency of complications within the first year of use was low among users of both types of IUDs in all age groups (Table 2). The most frequent complications were disorders of menstruation. The most serious complications associated with IUD use, ectopic pregnancy and pelvic inflammatory disease, were observed in less than 1% of all patients regardless of age or IUD type. Uterine perforation was rare.
Comparison of complications by age group demonstrated few differences (Table 3). Women 15–19 years of age were more likely than 25–44 year olds to have a claim for dysmenorrhea or absence of menstruation within 1 year of insertion. Failure of the IUD to prevent a normal pregnancy was observed more often among 15–19 year olds than 25–44 year olds. Comparison of complications by type of IUD demonstrated that overall, use of the levonorgestrel-releasing intrauterine system was associated with fewer observed complications than the copper IUD. Levonorgestrel-releasing intrauterine system had reduced odds of seven complications as well as reduced odds of abnormal pregnancy and normal pregnancy compared with the copper IUD. For all other complications, the levonorgestrel-releasing intrauterine system had similar odds compared with the copper IUD. In analyses stratified by age group, levonorgestrel-releasing intrauterine system users in each age group were less likely to have a diagnosis of dysmenorrhea compared with copper IUD. However, the odds of all other complications from the two IUDs were equivalent (analyses not shown).
Overall, early discontinuation rates did not differ between women 15–19 years of age and those 25–44 years of age (13% compared with 11%, respectively, P>.05). However, IUD type was an important factor in continuation rates. Women of all ages who received the levonorgestrel-releasing intrauterine system were less likely to discontinue its use within 12 months as compared with those who received the copper IUD (Fig. 2). Moreover, the proportion of copper IUD users that discontinued was markedly higher among teenagers as compared with other age groups. Although it cannot be determined whether an IUD was removed as a result of a complication, this study also examined removal of an IUD within 30 days after a complication to try to estimate the frequency with which IUDs were being removed as a result of complications or failure rather than some other reason. In this study, the copper IUD device was more likely to be removed within 30 days of a complication or failure than the levonorgestrel-releasing intrauterine system (OR 1.34, 95% CI 1.21–1.48). In particular, women who reported abnormal menstrual bleeding (OR 1.42, 95% CI 1.27–1.59) or pregnancy (OR 4.42, 95% CI 2.98–6.56) in the last month were more likely to discontinue the copper IUD than the levonorgestrel-releasing intrauterine system (analyses not shown). Age was not significantly associated with discontinuation of the IUD within 30 days of a complication or failure.
The percentage of reproductive-aged women who ever used an IUD for birth control steadily declined in the United States from 18% to 6% between 1982 and 2002. However, an increase in insertion rates was observed among insured women from two per 1,000 in 2002 to eight per 1,000 in 2007.7,20 By 2008, 5.5% of all contraceptive patients reported using an IUD.22 We also observed an increase in IUD insertions between 2002 and 2009. Together, these studies demonstrate resurgence in the popularity of this contraceptive method among insured U.S. women.
Our study also demonstrated significant growth in the frequency of teenagers using an IUD for contraception. However, many teenagers in this study received their device after delivery of a neonate, suggesting that this method may not be prescribed as often to nulliparous teenagers. Thus, educational programs still may be needed to communicate the safety of IUD use in adolescents who have not given birth.
Amenorrhea and dysmenorrhea, which occurred more frequently among teenagers than adults, is not a major issue because neither places the patient at risk of harm. Many young women actually consider amenorrhea a benefit,23 and dysmenorrhea may be treated with nonsteroidal anti-inflammatory agents. The complication of greatest concern to most health care providers, pelvic inflammatory disease, occurred in less than 1% of users regardless of age or IUD type. This finding is in agreement with a prior study demonstrating that the risk of developing pelvic inflammatory disease with an IUD in place is similar to the risk of developing pelvic inflammatory disease without an IUD.24
Overall, copper IUD users were more likely to experience failure of the device to prevent pregnancy than patients using the levonorgestrel-releasing intrauterine system. This difference could have occurred by chance because few pregnancies were detected. Similar to our study, a report on 136 adolescent mothers up to 22 years of age showed that pregnancy rates with the copper IUD were 6.2% compared with 3.7% among levonorgestrel-releasing intrauterine system users.14 The authors acknowledged that their pregnancy rates were higher than reported in adult patients but could offer no explanation, because pre-existing pregnancies resulting from luteal phase placements had been ruled out and the IUD's presence in the fundus had been confirmed in all patients. We were not able to do this, so it is possible that some pregnancies in our study were the result of luteal phase placements or spontaneous expulsions that were not coded. Additionally, our observation of elevated odds of pregnancy in younger women (15–19 year olds) compared with those 25 years and older may be the result of differences in fertility between the younger and older groups, leading to the observed differences.
This study sheds important light on premature discontinuation of IUDs among young women. We observed that copper IUD discontinuation rates were markedly higher among 15–19 year olds than women in the other age groups, whereas discontinuation rates among levonorgestrel-releasing intrauterine system users were similar among all three age groups. Furthermore, among females who discontinued IUD use as a result of complications or pregnancy, copper IUDs were more likely to be removed than levonorgestrel-releasing intrauterine systems. These data suggest that the levonorgestrel-releasing intrauterine system may be a better choice for most women than the copper IUD, when available, because it may result in fewer side effects and lower discontinuation rates. However, physicians should consider the needs of each individual patient when discussing contraceptive options, because not all women may desire amenorrhea, which is common among levonorgestrel-releasing intrauterine system users. Overall, this study supports the use of both IUD types because the higher likelihood of discontinuation observed with the copper IUD is still favorable when compared with the high discontinuation rates of other reversible contraceptives.21,25 To confirm our findings, further prospective studies on complications of both types of IUDs should be conducted in nulliparous adolescent patients in the United States.
This study has several limitations. Its observational nature could have introduced selection bias with regard to type of IUD inserted. Second, it should also be noted that the women in this sample were all insured, so the results may not be applicable to lower income women. In addition, we used a claims database, which likely resulted in underreporting of some complications. Claims data are intended for billing, not research purposes, so we did not have information on women who experienced a complication but did not notify their health care provider. However, there is no reason why women who experienced a complication with one IUD type would be more likely than those with the other type to report the same complication to their health care provider. Furthermore, use of a national database allows information to be collected on a large sample, which may not otherwise be possible. Finally, we could not confirm the diagnosis because charts were not available. This is of special concern regarding pregnancy. We used claims codes that indicated pregnancy for the outcome “normal pregnancy” but could not confirm the pregnancy in many cases. In addition, it was not always possible to determine whether pregnancy occurred as a result of spontaneous expulsion, because a claim may not have been made. Miscoding or lack of coding for spontaneous expulsion may also have led to an underestimate of the number of patients who discontinued IUD use during the 1-year follow-up period.
Overall, these data indicate that the IUD is an appropriate contraceptive for younger women and is not likely to cause serious side effects among teenagers. Physician recommendations play an important role in their patients' decision-making, and their recommendation of the IUD could increase the use of this cost-effective and safe method of birth control among teenagers. Thus, physicians should include information about this highly effective method when they counsel young patients on their contraceptive options to help reduce the unintended pregnancy rate among teenagers in the United States.
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