• Birth Defect Cases and Case Rates

  In the years 2016 and 2017, there were 14,092 and 12,640 cases of birth defects reported for children under one year of age, respectively. The 2016-2017 average rate was about 1,188 cases per 10,000 resident live births. Not all birth defects are reported when the child is an infant, and for those born during 2017, there was an additional 1,307 cases reported for children in the second year of life. Therefor, for infants born in 2017, there were 1,250.8 birth defects per 10,000 resident live births. Between 2013 to 2017, the five-year average prevalence rate for two-year olds based upon reported cases was about 1,326.3 per 10,000 live births. Because birth defect prevalence rates tend to be osculatory in nature, it can be difficult to detect an overall trend from recent data. However, it should be noted that the birth defect rates in 2013, 2014 and 2016 are the highest birth defects rates reported in a decade. (See Birth Defects Cases and Case Rates.)

• Infant Death Rates

  In 2017, infants born with a birth defect were over 3 times more likely to die than other infants. The infant death rate for children born in 2017 with a reportable birth defect was 25.7 per 1,000, but the overall infant death rate was 7.5 per 1,000 resident infants born in Michigan during the same year. Birth defect rates were higher between 2013-2017 than the rates in previous years, but the rate of infant deaths born with birth defects is showing a gradual, uneven decline since the 1990s and 2000s. (See Mortality Rates Among Children.)

• Mortality Risk

  A higher mortality risk can be expected for children with birth defects well beyond the first year of life. The cumulative mortality rate for resident children under 5 years of age born during 2013 was 8.4 per 1,000. Children born during 2013 with a birth defect had a cumulative mortality rate of 30.5 per 1,000 by the end of the fifth year of life. The mortality rate differential remains high throughout early childhood. For children under the age of 18 years, the mortality rates for children born with birth defects are about 5 times higher than other children; 61.4 per 1,000 for children with birth defects versus 12.4 per 1,000 for children generally. The significantly higher mortality rate for children with birth defects underscores the seriousness of these conditions. (See Cumulative Mortality Among Children.)

• Birth Defects By Diagnostic Code Groups

  The three most common diagnostic categories reported in 2017 were musculoskeletal system defects (1,898 cases), heart and circulatory system defects (2,381 cases) and anomalies of the genital and urinary systems (1,658 cases). Congenital Anomalies of the integument remained above 1,000 cases for the last five years, with the number of such defects peaking at 2,274 in 2014---about 175% of its ten year average. (See Birth Defects by Diagnostic Code Group by Birth Year.)

  With regard to mortality, the number of deaths between 2015-2017 for children with heart and circulatory anomalies was 384, about 3 times that of other leading causes of birth defect related deaths. Infant mortality rates were highest for the chromosomal anomalies (113.5 per 1,000 born with the defect) and for central nervous system anomalies (63.3 per 1,000), based upon mortality among the 2015-2017 birth cohorts. (See Infant Deaths to Michigan Children with Reported Birth Defects and Mortality Rates.) Mortality rates averaged over six years allow for the stable estimates of birth defect death rates by detailed diagnositic code groups. Birth defects mortality were highest for certain rare congenital anomalies: Trisomy 13 (Patau Syndrome) was 700 per 1,000; Trisomy 18 (Edward Syndrome) was 489.6 per 1,000; and Anencephalus was 571.4 per 1,000. (See Mortality Rates of Michigan Children with Reported Birth Defects by Detailed Diagnostic Code Group.)

  
  Tables describing detailed condition information also include numbers.

Data Limitations and Cautions

There are three potential sources of error in these data, especially at the county level:

• Data are based on passive reporting which means it is the responsibility of facilities to identify and report cases of birth defects. Not all facilities report cases as completely and timely as would be the ideal.
• Some facilities report children with a birth defect that is later "ruled out" resulting in an over count of the actual number of cases.
• Children diagnosed and treated in facilities in other states may be missed which will significantly affect the completeness of data for Michigan’s border counties.