Year | Response Ratea | Unweighted sample sizeb | ||||||
---|---|---|---|---|---|---|---|---|
Household-level response | Person-level response | Combined response rate | Total | Chronic Back Disorders | Analyzed | |||
Yes | No | Missing | ||||||
2007 | 84.6 | 91.7 | 77.6 | 46,634 | 9724 | 36,845 | 65 | 46,569 |
2008 | 84.6 | 91.7 | 77.6 | 45,793 | 11,515 | 34,218 | 60 | 45,733 |
2009 | 81.3 | 90.0 | 73.2 | 42,483 | 8896 | 33,547 | 40 | 42,443 |
2010 | 80.7 | 88.6 | 71.5 | 42,928 | 8784 | 34,102 | 42 | 42,886 |
2011 | 79.5 | 87.8 | 69.8 | 43,156 | 8735 | 34,358 | 63 | 43,093 |
2012 | 77.3 | 86.7 | 67.0 | 41,415 | 8327 | 33,026 | 62 | 41,353 |
2013 | 76.6 | 87.2 | 66.8 | 42,052 | 8518 | 33,472 | 62 | 41,990 |
2014 | 75.1 | 87.4 | 65.6 | 40,663 | 8352 | 32,247 | 64 | 40,599 |