| * The estimate is considered unstable (relative standard error is greater than 30 percent). |
| **Estimate is considered unreliable (relative standard error greater than 40 percent). |
| a Children ever diagnosed with asthma that still have asthma. |
| b Missing family income data were imputed for 28–30 percent of children ages 0–17 in 2001–2007. |
| c The revised 1997 OMB standards for race were used for the 2001–2007 race-specific estimates. A person's race is described by one or more of five racial groups: White, Black or African American, American Indian or Alaska Native, Asian, or Native Hawaiian or Other Pacific Islander. Data on race and Hispanic origin are collected separately, but are combined for reporting. Included in other categories but not shown separately under race and Hispanic origin are Native Hawaiians or Other Pacific Islanders and respondents with "Two or more races." Persons of Hispanic origin may be of any race. |
| d "Central city" is defined as the central city of a Metropolitan Statistical Area (MSA), while "Non-central city" is defined as an area in an MSA outside of the central city or in an area outside of an MSA. For more information on MSA's, see: National Center for Health Statistics. Health, United States, 2008. Appendix II, p. 555. Retrieved from http://www.cdc.gov/nchs/data/hus/hus08.pdf. |
| SOURCE: National Center for Health Statistics, National Health Interview Survey. |