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. Author manuscript; available in PMC: 2010 May 7.
Published in final edited form as: Psychol Sci. 2009 Mar 20;20(4):488–494. doi: 10.1111/j.1467-9280.2009.02323.x

TABLE 1. Characteristics of the Study Population in 1993 (N = 3,376).

No. of care hours provided per week
Variable None
(n = 2,732)		 1 to 14
(n = 306)		 14 or more
(n = 338)
Deceased by 2000 interview 756 74 79
Spousal need
 No. impairments in ADLs
  0 2,399 167 137
  1–3 312 125 141
  4–6 21 14 60
 No. impairments in IADLs
  0 2,365 89 107
  1–3 358 213 197
  4–6 9 4 34
 Cognitive impairment (mild, moderate, or severe) 62 21 39

Note. Spouses’ number of impairments in activities of daily living (ADLs) and instrumental activities of daily living (IADLs) were obtained by spouses’ self-report.