Hospital of Delivery and the Racial Differences in Late Preterm and Early-Term Labor Induction

Karna Murthy; Michelle Macheras; William A. Grobman; Scott A. Lorch

doi:10.1055/s-0035-1544191

American Journal of Perinatology, Inhaltsverzeichnis

Am J Perinatol 2015; 32(10): 952-959
DOI: 10.1055/s-0035-1544191

Original Article

Thieme Medical Publishers 333 Seventh Avenue, New York, NY 10001, USA.

Hospital of Delivery and the Racial Differences in Late Preterm and Early-Term Labor Induction

Karna Murthy

¹Department of Pediatrics, Ann and Robert H. Lurie Children's Hospital of Chicago, Chicago, Illinois

²Department of Pediatrics, Feinberg School of Medicine, Northwestern University, Chicago, Illinois

,

Michelle Macheras

³Division of Neonatology, Department of Pediatrics, Children's Hospital of Philadelphia and the Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania

,

William A. Grobman

⁴Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, Feinberg School of Medicine, Northwestern University, Chicago, Illinois

,

Scott A. Lorch

³Division of Neonatology, Department of Pediatrics, Children's Hospital of Philadelphia and the Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania

› Institutsangaben

Abstract

Objectives To estimate the interhospital differences in induction of labor (IOL) from 34^0/7 to 38^6/7 weeks' gestation by race/ethnicity.

Methods Women between 34 and 42 weeks' gestation during 1995 and 2009 in three states were identified using linked maternal and infant records. Women with prior cesarean delivery, premature rupture of membranes, gestational hypertension, who delivered at hospitals with < 100 annual births, or who had missing data were excluded. The outcomes were inductions at early-term (ETI: between 37^0/7 and 38^6/7 weeks') and late preterm (LPI: from 34^0/7–36^6/7 weeks') gestations. Cox proportional hazard ratios (HR) were used to estimate the independent associations between race/ethnicity and hospital of delivery on ETI and LPI.

Results A total of 6.98 million eligible women delivered at 469 hospitals. ETI and LPI occurred in 3.20 and 0.40% of women, respectively. Non-Hispanic white women (3.99%) received ETI most commonly; conversely, LPI was highest among non-Hispanic black women (0.50%). In multivariable analyses, non-Hispanic black race was protective for ETI (HR = 0.89; p < 0.01) and was a risk factor for LPI (HR = 1.26; p < 0.01) after adjusting for patient factors and the delivery hospital.

Conclusion Racial differences in ETI and LPI appear to be pervasive. Much of the unaccounted racial/ethnic variation remains seems secondary to within-hospital differences in selecting women for IOL.

Keywords

epidemiology - induction of labor - late preterm - early-term - vital statistics

Volltext

Referenzen

References
1 Murthy K, Holl JL, Lee TA, Grobman WA. National trends and racial differences in late preterm induction. Am J Obstet Gynecol 2011; 205 (5) 458.e1-458.e7
2 Murthy K, Grobman WA, Lee TA, Holl JL. Trends in induction of labor at early-term gestation. Am J Obstet Gynecol 2011; 204 (5) 435.e1-435.e6
3 Gyamfi-Bannerman C, Fuchs KM, Young OM, Hoffman MK. Nonspontaneous late preterm birth: etiology and outcomes. Am J Obstet Gynecol 2011; 205 (5) 456.e1-456.e6
4 Hibbard JU, Wilkins I, Sun L , et al; Consortium on Safe Labor. Respiratory morbidity in late preterm births. JAMA 2010; 304 (4) 419-425
5 MacDorman MF, Declercq E, Zhang J. Obstetrical intervention and the singleton preterm birth rate in the United States from 1991-2006. Am J Public Health 2010; 100 (11) 2241-2247
6 Spong CY, Mercer BM, D'alton M, Kilpatrick S, Blackwell S, Saade G. Timing of indicated late-preterm and early-term birth. Obstet Gynecol 2011; 118 (2 Pt 1): 323-333
7 Moore J, Low LK. Factors that influence the practice of elective induction of labor: what does the evidence tell us?. J Perinat Neonatal Nurs 2012; 26 (3) 242-250
8 Koopmans CM, Bijlenga D, Groen H , et al; HYPITAT study group. Induction of labour versus expectant monitoring for gestational hypertension or mild pre-eclampsia after 36 weeks' gestation (HYPITAT): a multicentre, open-label randomised controlled trial. Lancet 2009; 374 (9694) 979-988
9 Lorch SA, Srinivas SK, Ahlberg C, Small DS. The impact of obstetric unit closures on maternal and infant pregnancy outcomes. Health Serv Res 2013; 48 (2 Pt 1): 455-475
10 Herrchen B, Gould JB, Nesbitt TS. Vital statistics linked birth/infant death and hospital discharge record linkage for epidemiological studies. Comput Biomed Res 1997; 30 (4) 290-305
11 Lorch SA, Kroelinger CD, Ahlberg C, Barfield WD. Factors that mediate racial/ethnic disparities in US fetal death rates. Am J Public Health 2012; 102 (10) 1902-1910
12 Parker JD, Schoendorf KC. Implications of cleaning gestational age data. Paediatr Perinat Epidemiol 2002; 16 (2) 181-187
13 Lorch SA, Baiocchi M, Ahlberg CE, Small DS. The differential impact of delivery hospital on the outcomes of premature infants. Pediatrics 2012; 130 (2) 270-278
14 Srinivas SK, Fager C, Lorch SA. Evaluating risk-adjusted cesarean delivery rate as a measure of obstetric quality. Obstet Gynecol 2010; 115 (5) 1007-1013
15 Alexander GR, Himes JH, Kaufman RB, Mor J, Kogan M. A United States national reference for fetal growth. Obstet Gynecol 1996; 87 (2) 163-168
16 Victora CG, Huttly SR, Fuchs SC, Olinto MT. The role of conceptual frameworks in epidemiological analysis: a hierarchical approach. Int J Epidemiol 1997; 26 (1) 224-227
17 Baker D, Taylor H, Henderson J ; ALSPAC Study Team. Avon Longitudinal Study of Pregnancy and Childhood. Inequality in infant morbidity: causes and consequences in England in the 1990s. J Epidemiol Community Health 1998; 52 (7) 451-458
18 Glantz JC. Obstetric variation, intervention, and outcomes: doing more but accomplishing less. Birth 2012; 39 (4) 286-290
19 Murthy K, Grobman WA, Lee TA, Holl JL. Racial disparities in term induction of labor rates in Illinois. Med Care 2008; 46 (9) 900-904
20 ACOG Committee on Practice Bulletins -- Obstetrics. ACOG Practice Bulletin No. 107: Induction of labor. Obstet Gynecol 2009; 114 (2 Pt 1): 386-397
21 American Congress of Obstetricians & Gynecologists (ACOG) Committee on Practice Bulletins. ACOG Committee Opinion no. 561: Non-Medically Indicated Early-Term Deliveries. Obstet Gynecol 2013; 121 (4) 911-915
22 Willinger M, Ko CW, Reddy UM. Racial disparities in stillbirth risk across gestation in the United States. Am J Obstet Gynecol 2009; 201 (5) 469.e1-469.e8
23 Reddy UM, Ko CW, Willinger M. Maternal age and the risk of stillbirth throughout pregnancy in the United States. Am J Obstet Gynecol 2006; 195 (3) 764-770
24 Aghideh FK, Mullin PM, Ingles S , et al. A comparison of obstetrical outcomes with labor induction agents used at term. J Matern Fetal Neonatal Med 2014; 27 (6) 592-596
25 Kochanek KD, Kirmeyer SE, Martin JA, Strobino DM, Guyer B. Annual summary of vital statistics: 2009. Pediatrics 2012; 129 (2) 338-348
26 Reichman NE, Schwartz-Soicher O. Accuracy of birth certificate data by risk factors and outcomes: analysis of data from New Jersey. Am J Obstet Gynecol 2007; 197 (1) 32.e1-32.e8
27 Baumeister L, Marchi K, Pearl M, Williams R, Braveman P. The validity of information on “race” and “Hispanic ethnicity” in California birth certificate data. Health Serv Res 2000; 35 (4) 869-883
28 Roohan PJ, Josberger RE, Acar J, Dabir P, Feder HM, Gagliano PJ. Validation of birth certificate data in New York State. J Community Health 2003; 28 (5) 335-346
29 Chauhan SP, Ananth CV. Induction of labor in the United States: a critical appraisal of appropriateness and reducibility. Semin Perinatol 2012; 36 (5) 336-343
30 Hoyert DL, Freedman MA, Strobino DM, Guyer B. Annual summary of vital statistics: 2000. Pediatrics 2001; 108 (6) 1241-1255
31 Bailit JL, Gregory KD, Reddy UM , et al. Maternal and neonatal outcomes by labor onset type and gestational age. Am J Obstet Gynecol 2010; 202 (3) 245.e1-245.e12
32 Stock SJ, Ferguson E, Duffy A, Ford I, Chalmers J, Norman JE. Outcomes of elective induction of labour compared with expectant management: population based study. BMJ 2012; 344: e2838