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Volume 23, Number 1—January 2017
Research

Cost-effectiveness of Increasing Access to Contraception during the Zika Virus Outbreak, Puerto Rico, 2016

Rui LiComments to Author , Katharine B. Simmons, Jeanne Bertolli, Brenda Rivera-Garcia, Shanna Cox, Lisa Romero, Lisa M. Koonin, Miguel Valencia-Prado, Nabal Bracero, Denise J. Jamieson, Wanda Barfield, Cynthia A. Moore, Cara T. Mai, Lauren C. Korhonen, Meghan T. Frey, Janice Perez-Padilla, Ricardo Torres-Muñoz, and Scott D. Grosse
Author affiliations: Centers for Disease Control and Prevention, Atlanta, Georgia, USA (R. Li, K.B. Simmons, J. Bertolli, S. Cox, L. Romero, L.M. Koonin, D.J. Jamieson, W. Barfield, C.A. Moore, C.T. Mai, L.C. Korhonen, M.T. Frey, J. Perez-Padilla, S.D. Grosse); Puerto Rico Department of Health, San Juan, Puerto Rico (B. Rivera-Garcia, M. Valenica-Prado, R. Torres-Muñoz); University of Puerto Rico and Puerto Rico Section of the American College of Obstetricians and Gynecologists, San Juan (N. Bracero)

Main Article

Table 1

Estimates of input parameters used in a model to assess cost-effectiveness of increasing access to contraception to women during the Zika virus outbreak, Puerto Rico, 2016*

Parameter Value in main scenario (range) Distribution Source
Epidemio parameters
Target population size† 163,000
Contraceptive use distribution at baseline‡ (8)
No method 9.35%
Less-effective methods 44.77%
Moderately effective methods 33.93%
Dual-method use with condoms 9.36%
Highly effective methods 2.60%
% Women receiving contraceptive services with intervention NSFG 2011–2013, expert opinion
No contraception users§ 50% (30%–70%) Uniform
Less-effective method users§ 60% (30%–80%) Uniform
Moderately effective method users§ 100%
% Women switching to a more effective method after receiving contraception counseling 50% (10%–80%) Uniform In-house expert opinion
Among women switching to a more effective method, % choosing highly effective methods¶ 50% (33%–67%) Uniform (9), authors’ assumptions
Contraceptive failure rate over 1 year (10)
No method 85% (68%–100%) Triangular
Less-effective methods 22% (18%–27%) Triangular
Moderately effective methods 9% (7%–11%) Triangular
Dual-method use with condoms 1.2% (1.0%–1.4%) Triangular Derived from NSFG 2011–2013; K. Pazol, pers. comm., ONDIEH, CDC, 2016
Highly effective methods
0.5% (0.4%–0.6%)
Triangular

Distribution of outcomes of unintended pregnancies
Induced abortion 28% Calculated based on (11)
Spontaneous abortion/fetal death 14% (12)
Live birth 58% Calculated based on (11) and (12)
Prevalence of Zika virus infection 25% (10%–70%) Uniform (12)
Prevalence of ZAM among mid-trimester pregnancies# 58/10,000 (32/10,000–86/10,000) Uniform (5)
Stillbirth rate of fetus with microcephaly 7% (5.4%–8.4%) Triangular (13)
Termination rate of fetus with ZAM** 28% (20%–50%) Uniform (14)
HLY lost because of 1 case of ZAM
30

(15)
Cost parameters, in 2015 US dollars
Intervention: training physicians, outreach, and administrative cost†† $39 ($31–$47) Triangular Budget from a pilot program to increase contraception access in Puerto Rico during 2016 Zika outbreak
Contraceptive counseling $10 ($5–$25) Uniform
Contraceptive methods and related services††,‡‡ (16)
Highly effective contraceptive methods§§ $666 ($533–$799) Triangular
Moderately effective contraceptive methods¶¶ $417 ($334–$501) Triangular
Dual-method use## $452 ($362,$543) Triangular
Less-effective contraceptive methods*** $35 ($28–$42) Triangular
LARC insertion††† $165 ($132–$198) Triangular (16)
LARC removal $109 ($87–$131) Triangular (16)
Provider office visit (for moderately effective method users) $43 ($34–$51) Triangular (16)
Provider office visit (for highly effective method users) $104 ($83–$125) Triangular (16)
Prenatal, delivery and postpartum care for mother and neonatal care for infant (not Zika virus–related)††,‡‡‡ $22,067 ($17,652–$26,479) Triangular Weighted average of vaginal and C-section from (17)
Prenatal care $3,506
Delivery and postpartum care $10,960
Neonatal care $7,599
Induced abortion†† $1,100 ($880–$1,320) Triangular Derived from 2014 MarketScan Commercial Claims database
Spontaneous abortion†† $1,100 ($880–$1,320) Triangular Assumed same as for induced abortion
Mid-trimester pregnancy termination†† $2,725 ($2,180–$3,269) Triangular (18)
Stillbirth††
$5,007 ($4,006–$6,009)
Triangular
(15)
Zika virus–associated cost
Cost of Zika-associated testing and monitoring of women during pregnancy††,§§§ $439 ($351–$527) Triangular Derived from 2014 MarketScan commercial claims database
Cost of Zika-associated testing among live-born infants with Zika-infected mothers††,¶¶¶ $211 ($169–$253) Triangular Derived from MarketScan commercial claims database, 2009–2014
Cost of testing for fetus with ZAM††,### $330 ($264–$396) Triangular Derived from MarketScan commercial claims database, 2009–2014
Cost of stillbirth with ZAM††,**** $5,776 ($4,621–$6,931) Triangular (15)
Cost of termination of fetus with ZAM††,†††† $5,027 ($4,021–$6,032) Triangular (17,18)
Cost of live-born infant with ZAM††,‡‡‡‡ $22,715 ($18,172–$27,258) Triangular (17)
Lifetime direct cost of live-born infants with ZAM§§§§ $3,788,843 ($2,243,124–$5,545,652) Triangular Derived in part from MarketScan commercial claims database, 2009–2014

*BRFSS, Behavior Risk Surveillance System; CDC, Centers for Disease Control and Prevention; HLY; healthy life years; IUD, intrauterine device; LARC, long-acting reversible contraceptive; NSFG, National Survey of Family Growth; ONDIEH, Office of Noncommunicable Diseases, Injury and Environmental Health; ZAM, Zika virus–associated microcephaly.
†Authors’ calculation based on 2015 Puerto Rico total population size, 2015 birth rate, and adjusted contraception usage in 2002 BRFSS in Puerto Rico (online Technical Appendix Table, http://wwwnc.cdc.gov/EID/article/23/1/16-1322-Techapp1.pdf).
‡Less-effective methods include condoms, spermicides, fertility awareness methods, withdrawal, sponge, and diaphragm. Moderately effective methods include oral contraceptive pills, patches, vaginal rings, and injectable contraceptives. Highly effective method includes IUDs and subdermal implants. Dual use refers to the combination of moderately effective method use and male condoms. The contraception use distribution at baseline (without intervention) is based on adjusting the distribution reported in the 2002 BRFSS in Puerto Rico excluding women using permanent contraception by assuming 5 percentage points fewer women using no contraception than in 2002, which is based on a 36% reduction of birth rate among women 15–44 years of age in Puerto Rico from 2002 to 2015 (National Vital Statistics Report for 2002 and 2015 unpublished birth data from Puerto Rico), and the reported reasons for US teen pregnancy reduction (http://www.cdc.gov/nchhstp/newsroom/docs/factsheets/yrbs-fact-sheet-final-508.pdf); the decline in teen pregnancies was the fastest of any age group in Puerto Rico during 2010–2014, as reported in National Vital Statistics Reports. Data from Title X clinics in Puerto Rico also show that the percentage of women of reproductive age served in Title X clinics increased from 2.2% in 2006 to 10% in 2015. We also assume that new contraception users have the same contraception method distribution as contraception users as reported in the 2002 BRFSS survey (8). We assume 22% dual use among moderately effective method users at baseline (based on NSFG 2011–2013 data and unpublished analyses supplied by Karen Pazol, ONDIEH, CDC; we accounted for the effectiveness of dual-method use in preventing pregnancy but not for preventing sexual transmission of Zika virus). We calculated method-specific annual pregnancy rates by multiplying the failure rates of contraception methods under typical use by a calculated correction factor of 0.88 to adjust for the model over-predicting the number of unintended births in 2015 using the typical failure rates only. Multiplying method-specific contraceptive failure rates by numbers of women in each method category typically results in more predicted pregnancies and births than are actually observed, in part because of heterogeneity in sexual behaviors (19).
§Assuming 50% of no contraception users, 60% of less-effective contraception users, and 100% of moderately effective contraception users will visit a healthcare provider for contraception services under intervention. Based on the NSFG 2011–2013, among women of reproductive age who did not intend to become pregnant and not using permanent contraceptive methods, 21% of no contraception users, 33% less-effective method users, 97% moderately effective method users had at least 1 visit for contraception services in the last 12 months (personal communication, Karen Pazol, ONDIEH, CDC, 2016). Contraceptive services include receiving a birth control method or a prescription, receiving a checkup for birth control, receiving counseling about birth control, receiving a sterilizing operation, receiving counseling about a sterilizing operation, receiving emergency contraception, or receiving counseling about emergency contraception. We assume the intervention will increase the percentage of women visiting their provider for contraception counseling.
¶In the Contraceptive CHOICE project (9), 67% of participants who wished to avoid pregnancy chose to use highly effective methods, and 33% chose to use moderately effective methods. For the main scenario, we applied those estimates to 40% of the target population, assuming that 40% of unintended pregnancies are unwanted, and assumed that 20% of the remaining 60% of switchers would choose highly effective methods.
#Ellington et al. (5) estimated 180 cases (interquartile range 100–270 cases) of congenital microcephaly associated with Zika virus in Puerto Rico among an estimated 31,272 births (unpublished birth data, Puerto Rico Department of Health, 2015). On the basis of those estimates, we estimated the prevalence of congenital microcephaly: 58/10,000 births (interquartile range 32/10,000–86/10,000).
**The pregnancy loss rate in the US Zika Pregnancy Registry as of July 21, 2016, was 35% (14). The termination rate is calculated as the overall pregnancy loss rate minus the assumed stillbirth rate.
††A range of the main value ±20% was used to create upper and lower bounds used in sensitivity analyses.
‡‡Includes cost for devices and costs for 1 year of injections, pills, patches, rings, condoms, and the cost for related services in the first year.
§§Weighted average cost for hormonal IUD (50%, $659), copper IUD (25%, $598), and implant (25%, $659), based on Contraception CHOICE study (9) and commonly used devices in Puerto Rico.
¶¶Weighted average cost for generic contraceptive pill (78%, $370/y), injectable (14%, $240/y plus $130 for consultation for the year), and ring or patch (8%, $964/y), with the distribution of moderately effective methods based on NSFG, 2011–2013.
##Weighted average cost of moderately effective method plus cost of less-effective method.
***Male condom.
†††Including the cost for checking the placement of IUD in the first year of insertion.
‡‡‡Weighted average for vaginal and C-section delivery, including prenatal care, delivery, postpartum, and neonatal cost at delivery and in the first 3 months.
§§§Assumes additional costs related to repeated Zika virus testing by IgM (1–2 tests) for all pregnant women, 4 extra detailed ultrasound examinations, and 25% of women getting amniocentesis during all Zika-positive pregnancies (25% infection rate at baseline, range 10%–70%) (5), based on Oduyebo et al. (20).
¶¶¶Assumes 2 Zika virus tests (IgM and PCR) for serum and placenta, cranial ultrasound, and eye examination for all infants born to Zika virus–positive mothers based on Fleming-Dutra et al. (21).
###Three PCR tests for Zika virus using placenta, cord, and brain tissues of the fetus based on Martines et al. (22).
****Assuming all prenatal care cost, including extra cost of Zika virus–associated testing and monitoring during pregnancy and extra cost for Zika virus–associated testing for fetus.
††††Assuming half of the prenatal care cost, including extra cost of Zika virus–associated testing and monitoring during pregnancy and extra cost for Zika virus–associated testing for fetus.
‡‡‡‡Cost of prenatal care and delivery and extra cost of Zika virus–associated testing and monitoring during pregnancy and testing of infants for Zika virus.
§§§§Present value of cumulative medical and supportive care cost for infant with ZAM, discounted at 3% annually and taking into account mortality. Expenditures by employer-sponsored health plans for privately insured children with combined diagnoses of microcephaly and congenital cytomegalovirus enrolled during the first 4 years of life were used to project medical costs for cases of ZAM.

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Page created: December 14, 2016
Page updated: December 14, 2016
Page reviewed: December 14, 2016
The conclusions, findings, and opinions expressed by authors contributing to this journal do not necessarily reflect the official position of the U.S. Department of Health and Human Services, the Public Health Service, the Centers for Disease Control and Prevention, or the authors' affiliated institutions. Use of trade names is for identification only and does not imply endorsement by any of the groups named above.
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