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This categorical variable (ZIPINC_QRTL) provides a quartile classification of the estimated median household income of residents in the patient's ZIP Code. The quartiles are identified by values of 1 to 4, indicating the poorest to wealthiest populations. These values are derived from ZIP Code-demographic data obtained from Claritas. Because these estimates are updated annually, the value ranges for the ZIPINC_QRTL categories vary by year. The dollar ranges represented by each category are:
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Quartile Ranges of ZIPINC_QRTL by Year
|
|
Year
|
Quartile 1
|
Quartile 2
|
Quartile 3
|
Quartile 4
|
| 1997 |
1-28,999 |
29,000-35,999 |
36,000-46,999 |
47,000+ |
| 1998 |
1-28,999 |
29,000-36,999 |
37,000-49,999 |
50,000+ |
| 1999 |
1-30,999 |
31,000-39,999 |
40,000-51,999 |
52,000+ |
| 2000 |
1-31,999 |
32,000-41,999 |
42,000-54,999 |
55,000+ |
| 2001 |
1-33,999 |
34,000-43,999 |
44,000-58,999 |
59,000+ |
| 2002 |
1-35,999 |
36,000-45,999 |
46,000-61,999 |
62,000+ |
| 2003 |
1-35,999 |
36,000-44,999 |
45,000-59,999 |
60,000+ |
| 2004 |
1-35,999 |
36,000-44,999 |
45,000 - 58,999 |
59,000+ |
| 2005 |
1-36,999 |
37,000-45,999 |
46,000-60,999 |
61,000+ |
| 2006 |
1 - 37,999 |
38,000 - 46,999 |
47,000 - 61,999 |
62,000+ |
| 2007 |
1 - 38,999 |
39,000 - 47,999 |
48,000 - 62,999 |
63,000+ |
| 2008 |
1 - 38,999 |
39,000 - 48,999 |
49,000 - 63,999 |
64,000+ |
| 2009 |
1 - 39,999 |
40,000 - 49,999 |
50,000 - 65,999 |
66,000+ |
| 2010 |
1 - 40,999 |
41,000 - 50,999 |
51,000 - 66,999 |
67,000+ |
| 2011 |
1 - 38,999 |
39,000 - 47,999 |
48,000 - 63,999 |
64,000+ |
| 2012 |
1 - 38,999 |
39,000 - 47,999 |
48,000 - 62,999 |
63,000+ |
| 2013 |
1 - 37,999 |
38,000 - 47,999 |
48,000 - 63,999 |
64,000+ |
| 2014 |
1 - 39,999 |
40,000 - 50,999 |
51,000 - 65,999 |
66,000+ |
| 2015 |
1 - 41,999 |
42,000 - 51,999 |
52,000 - 67,999 |
68,000+ |
| 2016 |
1 - 42,999 |
43,000 - 53,999 |
54,000 - 70,999 |
71,000+ |
| 2017 |
1 - 43,999 |
44,000 - 55,999 |
56,000 - 73,999 |
74,000+ |
| 2018 |
1 - 45,999 |
46,000 - 58,999 |
59,000 - 78,999 |
79,000+ |
| 2019 |
1 - 47,999 |
48,000 - 60,999 |
61,000 - 81,999 |
82,000+ |
| 2020 |
1 - 49,999 |
50,000 - 64,999 |
65,000 - 85,999 |
86,000+ |
| 2021 |
1 - 51,999 |
52,000 - 65,999 |
66,000 - 87,999 |
88,000+ |
| 2022 |
1 - 55,999 |
56,000 - 70,999 |
71,000 - 93,999 |
94,000+ |
Availability of information on the NIS for the median household income of the patient's ZIP Code:
- Starting in 2003, ZIPINC_QRTL is available.
- For the years 1998-2002, another categorical variable (ZIPINC) indicates the median household income of the patient's ZIP Code of residence based on 1999 demographics. The categories are defined so that the maximum for category 1 ($25,000) is approximately 150% of the 1999 poverty level and the boundary between the second and third categories ($35,000) is approximately the national median household income.
- Prior to 1998, information on the median household income for a patient's ZIP Code was retained in two data elements ZIPINC4 and ZIPINC8.
To protect patient confidentiality, precautions are taken to mask ZIP Codes. ZIPINC_QRTL values have been suppressed for all ZIP Codes with populations below a minimum threshold. Also, when only one ZIP Code in a state was represented in a particular ZIPINC_QRTL category, ZIPINC_QRTL was set to missing (.). ZIPINC_QRTL is also reported as missing when the patient's ZIP Code was not reported, or it could not be matched to the Claritas file. The source data reports the income value "9999" when data are not available for a ZIP code. These values are still interpreted as if they are incomes for HCUP.
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