Survey Results

Survey Items: CCONDL08; FHEAD; CHEADYR; CPNOTHYR; CANXNWYR; CDEPRSYR; ADD2; CSTRESYR; CFATYR; CINSYR; DALLG1; DALLG2; DIARH1; DIARH2; CCONMED; CASHMEV; CASHYR; HAYF1; HAYF2; RALLG1; RALLG2; EARINF1; EARINF2; CCONDL6R; CCONDL02; CCONDL01; CCONDL03; AMR1R; AMR2R; STUTTER; AODD1; AODD2; LEARND; SEIZE1; SEIZE2; CHEARST1; CVISION; SALLG1; SALLG2; CCONDL09; CCONDL10; CCHLYR; CHPYR; CCONDL04; CCONDL07; COVRWTYR; ANEMIA1; ANEMIA2; CCONDL05

Denominator: Children age 0-17 years

Numerator: Child has two or more chronic health conditions; Child has one chronic health condition; Child does not have any chronic health conditions

Revisions and Changes: N/A

Additional Notes: The chronic condition variable is derived from responses to 27 health conditions asked about the Sample Child Core. The chronic conditions are: (a) EVER told by health professionals: arthritis, asthma episode or asthma attack in past 12 months, autism or autism spectrum disorder, cerebral palsy, Down syndrome, muscular dystrophy, intellectual disability known as mental retardation, other developmental delay, congenital heart disease, other heart condition, cystic fibrosis, diabetes, sickle cell anemia; (b) conditions whether the child told by a doctor or other health professionals that child has had ADD/ADHD (c) conditions child has had in the past 12 months: frequent or severe headaches including migraines, stuttering or stammering, food or digestive allergy, frequent/repeated diarrhea or colitis, hay fever, respiratory allergy, three or more ear infections, seizures (6-17 years), little/moderate/lot of trouble hearing without the hearing aid or deaf, any trouble seeing, even when wearing glasses or contact lenses, eczema or skin allergy, anemia, and (d) condition ever told by school or health professional: learning disability.

Treatment of Unknown Values: Unknown values (responses coded as 'refused', 'don't know', or ‘not ascertained’) are not included in the denominator when calculating prevalence estimates and weighted population counts displayed in the data query results table. The proportion of unknown values is less than 1% in almost every indicator. Exceptions are noted in the form of a "Data Alert" at the bottom of a results table. Weighted population counts are underestimates due to both item nonresponse and unknowns, both of which are excluded from the counts.

History and Development: NHIS is a cross-sectional household interview survey that has been conducted continuously by the National Center for Health Statistics (NCHS) of the Centers for Disease Control and Prevention (CDC) since 1957. The content of the survey has been updated every 10-15 years and the last major revision occurred in 1997. The revised NHIS questionnaire has Core questions and Supplements. The content of the Core has remained largely the same since the last revision. The Supplements are used to reflect to new data essential for public health emerging issues. For example, in 2011 and 2012, enhanced health care access and utilization questions that are intended to address provisions and measure the effects of the Affordable Care Act were incorporated and food security questions were added. The survey sample design is redesigned every decennial years and the current sampling plan was implemented in 2006. All final data components are verified by NCHS staff prior to public release. More information can be found in the “Learn About the Surveys” section of this website and at the CDC website at: http://www.cdc.gov/nchs/nhis.htm.