Prevalence and Risk Factors for Spina Bifida in Latino Populations Mark Canfield, Ph.D. Manager, Birth Defects Epidemiology and Surveillance Branch Texas DSHS
Association of Spina Bifida with Maternal Race/Ethnicity 1 Canfield et al Pediatr Perinatal Epidemiol. 2 Carmichael et al BDRA. 3 Canfield et al BDRA. Study LocationYearsNo. of Cases Relative Risk* (95% CI) Texas – (0.9–1.6) California – ( ) National – (1.0–1.4) *Compared to the referent category of non-Hispanic whites
Variable Whites cPR 1 Hispanics cPR 1 (95% CI) Blacks cPR 1 (95% CI) Subtype (N=923)(N=513)(N=316)(N=94) SB M 2 (N=790)Referent1.20 (1.03–1.40)0.89 (0.71–1.12) SB L 3 (N=133)Referent1.74 (1.23–2.46)0.25 (0.09–0.69) TotalReferent1.27 (1.11–1.46)0.80 (0.65–1.00) Case type SB M 2 (N= 790)(N=443)(N=257)(N=90) Isolated (N=683)Referent1.19 (1.01–1.40)0.79 (0.61–1.02) Multiple major defects (N=107)Referent1.26 (0.82–1.95)1.63 (0.97–2.72) Lesion level, isolated SB M 2 (N=657) (N=377)(N=215)(N=65) Cervical (N=5)Referent2.06 ( )2.20 ( ) Thoracic (N=55)Referent1.33 ( )1.41 ( ) Lumbar (N=525)Referent1.21 ( )0.67 ( ) Sacral (N=72)Referent0.83 ( )0.88 ( ) 1 PR = Prevalence ratio 2 SB M = Myelomeningocele, meningocele, and myelocele 3 SB L = Lipomyelomeningocele and lipomeningocele Agopian et al Am J Med Genet A. Association of Race/Ethnicity with Spina Bifida Stratified by Clinical Subtype,
Variable Whites (N=385) PR 1 Hispanics (N=221) PR 1 (95% CI) Blacks (N=70) PR 1 (95% CI) Sex, isolated SB M 2 (N=676) Male (N=340)Referent1.55 (1.23–1.95)1.12 (0.80–1.56) Female (N=336)Referent0.90 (0.70–1.14)0.55 (0.37–0.82) Agopian et al Am J Med Genet A. 1 PR=Prevalence ratio 2 SB M =Myelomeningocele, meningocele, and myelocele Association of Race/Ethnicity with Spina Bifida Stratified by Infant Sex,
CharacteristicCrude OR (95% CI) FatherWhiteReferent Hisp., US born1.30 (0.92–1.82) Hisp., MX/CA* born, 5+yrs in US1.95 (1.34–2.85) Hisp., MX/CA* born, <5yrs in US2.28 (1.13–4.58) MotherWhiteReferent Hisp., US born1.23 (0.92–1.63) Hisp., MX/CA* born, 5+yrs in US2.16 (1.56–3.00) Hisp., MX/CA* born, <5yrs in US1.92 (1.23–2.99) BothWhiteReferent Hisp., US born1.33 (0.88–2.02) Hisp., MX/CA* born, 5+yrs in US2.45 (1.49–4.03) Hisp., MX/CA* born, <5yrs in US3.28 (1.46–7.37) *MX/CA = Mexico/Central America Canfield et al BDRA. Association of Maternal and Paternal Hispanic Birthplace/Immigration Factors with Spina Bifida, 1997–2003
Decline in the Prevalence of Spina Bifida by Race/Ethnicity US, 1995 – 2002 Williams et al Pediatrics. Fortification
Prevalence of Spina Bifida in 10 US Regions, 2002 *Adjusted for maternal age Shin et al Pediatrics.
Association of Race/Ethnicity with Selected Self-reported Preconception Health Indicators– Texas Pregnancy Risk Assessment Monitoring System, 2002–2010 Maternal Factors White (n=5413) Hispanic (n=5758) PR (95% CI) Black (n=4215) PR (95% CI) SmokingReferent0.35* ( ).54* (0.49–0.60) No daily multivitaminReferent1.18* (1.14–1.21)1.18* (1.15–1.21) ObeseReferent1.29* ( )1.49* (1.36–1.64) CDC Publication pending. * Association is statistically significant in multivariate models that included age, race/ethnicity, education, insurance, Medicaid, and pregnancy intent.
Variable # Foreign-Born# U.S.-BornAdjusted OR*95% CI Smoking –0.37 Exposure to Passive Smoke –0.98 Periconceptional Folic Acid Supplements (daily v. none) –0.98 Obese (v. normal BMI) –0.66 *Odds ratio adjusted for maternal age, education, and pregnancy intention, referent group is U.S. born Ramadhani et al BDRA. The Association of Nativity with Selected Maternal Factors, Hispanic NBDPS Controls, 1997–2005
Folic Acid Awareness and Use Among Women with a History of an NTD-Affected Pregnancy Texas, 2000–2001 Canfield et al MMWR.
Texas Neural Tube Defect Project–Mexican Americans on TX-US Border, Cluster: Brownsville, Texas peer reviewed articles on risk factors NTD risk factors for folic acid deficient population: –Low serum B 12 –Periconceptional hyperthermia –Exposure to nitrosatable drugs with high nitrate/nitrite intake –Periconceptional diarrhea –Exposure to fumonisins –Hyperinsulinemia –Passive smoke exposure
Summary Relative to whites, Latinos are: –Only at modestly elevated risk of spina bifida, regardless of clinical phenotype or pattern –At greater risk if one/both parents foreign born –Less likely to be exposed to smoke (Foreign-born>US-born) –Less likely to supplement (Foreign-born>US-born) –More likely to be obese (US-born>Foreign-born)
Mark A Canfield, PhD, Manager Birth Defects Epidemiology and Surveillance Branch Texas Department of State Health Services Phone: (512) Web site: THANK YOU