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. Author manuscript; available in PMC: 2020 Dec 4.
Published in final edited form as: Med Care. 2020 Sep;58(9):842–849. doi: 10.1097/MLR.0000000000001363

TABLE 3.

Adjusted Estimates for the Associations Between the Study Variables and the CAPACITY Total Score, Communication Domain Score, and Capacity Domain Score

Description of Included Variables Communication Domain
 Capacity Domain
 Overall
Ratio (95% CI) P* Ratio (95% CI) P* Ratio (95% CI) P*
Primary variables of interest
 Cognitive impairment (TICS-M), per 5-point increase (patient) 0.98 (0.97, 0.99) < 0.001 0.95 (0.94, 0.97) < 0.001 0.97 (0.96, 0.98) < 0.001
 Health literacy (care partner) 0.99 (0.98, 1.00) 0.19 0.97 (0.94, 0.99) 0.008 0.98 (0.97, 1.00) 0.02
Patient characteristics
 General health status 1.00 (0.99, 1.01) 0.77 0.98 (0.95, 1.00) 0.05 0.99 (0.98, 1.00) 0.19
 Education 0.10 0.11 0.049
  High school graduate or less Reference Reference Reference
  Some college 0.97 (0.94, 1.00) 0.07 0.94 (0.88, 1.01) 0.10 0.96 (0.92, 1.00) 0.04
  Bachelor’s degree 0.97 (0.94, 1.01) 0.14 0.94 (0.87, 1.00) 0.07 0.96 (0.92, 1.00) 0.05
  Graduate degree 0.96 (0.93, 0.99) 0.01 0.92 (0.85, 0.98) 0.01 0.94 (0.91, 0.98) 0.005
Care partner characteristics
 Age < 0.001 0.007 < 0.001
  < 75 Reference Reference Reference
  75–84 0.97 (0.95, 0.99) 0.008 0.93 (0.88, 0.98) 0.007 0.96 (0.93, 0.99) 0.003
  85+ 0.90 (0.85, 0.96) 0.002 0.87 (0.76, 1.00) 0.046 0.89 (0.82, 0.96) 0.004
 Male 0.96 (0.94, 0.99) 0.002 1.09 (1.04, 1.14) < 0.001 1.01 (0.98, 1.04) 0.65
 Race
  White Reference Reference Reference
  Other race 1.00 (0.96, 1.06) 0.85 1.14 (1.03, 1.25) 0.01 1.05 (0.99, 1.12) 0.10
 Education 0.14 0.008 0.02
  High school graduate or less Reference Reference Reference
  Some college 1.02 (0.98, 1.05) 0.29 1.03 (0.96, 1.11) 0.45 1.02 (0.98, 1.07) 0.29
  Bachelor’ s degree 1.02 (0.99, 1.06) 0.26 0.99 (0.92, 1.07) 0.77 1.01 (0.97, 1.05) 0.64
  Graduate degree 1.04 (1.00, 1.08) 0.03 1.09 (1.01, 1.18) 0.02 1.06 (1.01, 1.11) 0.01
 Relationship to patient
  Spouse/significant other Reference Reference Reference
  Parent/other 1.00 (0.96, 1.03) 0.89 1.08 (1.00, 1.17) 0.06 1.03 (0.98, 1.07) 0.27
 Employment 0.95 0.51 0.69
  Not working or don’t know/refused Reference Reference Reference
  Part-time 1.00 (0.97, 1.03) 0.86 0.96 (0.89, 1.03) 0.27 0.98 (0.94, 1.02) 0.41
  Full-time 0.99 (0.95, 1.04) 0.75 0.97 (0.88, 1.06) 0.51 0.99 (0.94, 1.04) 0.63
 Time providing care for the patient < 0.001 0.002 < 0.001
  Not providing care or don’ t know/refused Reference Reference Reference
  05 h or fewer a wk 0.97 (0.94, 1.00) 0.02 0.91 (0.86, 0.97) 0.003 0.95 (0.92, 0.98) 0.003
  06–19 h a wk 1.03 (1.00, 1.07) 0.07 1.03 (0.96, 1.11) 0.44 1.03 (0.99, 1.08) 0.14
  20–39 h a wk 1.04 (0.99, 1.09) 0.13 1.02 (0.92, 1.13) 0.70 1.03 (0.97, 1.09) 0.27
  40 or more hours a wk 1.07 (1.02, 1.13) 0.004 1.07 (0.97, 1.19) 0.17 1.07 (1.01, 1.14) 0.02
 General health status 0.98 (0.97, 0.99) 0.002 0.99 (0.96, 1.01) 0.32 0.98 (0.97, 1.00) 0.03
 Depression (PHQ-2) 0.93 (0.89, 0.97) 0.001 0.94 (0.85, 1.03) 0.16 0.93 (0.88, 0.98) 0.01
 Subjective burden (Zarit), per 5-point increase 0.99 (0.98, 1.00) 0.003 0.99 (0.97, 1.00) 0.12 0.99 (0.98, 1.00) 0.01

As a sensitivity analysis, we reran these models among the 1557 care partners who reported attending the patient’s medical visits “most of the time” or “always,” because we hypothesized that the associations may be even stronger with CAPACITY. In the interest of brevity, these results are available upon request, showing associations between the study variables and CAPACITY scores that were consistent with the main findings. We also reran these models including care partner cognitive status (TICS-M), and results were similar. These results are also available upon request.

*

For categorical variables parameterized with binary indicator variables, the P-values shown on the unindented rows are for type 3 tests for the overall contribution of that variable to the model. Likelihood ratio x2 tests indicated the covariates included provided significant improvement in explaining the variance of the outcome (all P < 0.0001).

CAPACITY indicates CAregiver Perceptions About Commun/ca7ion with Clinical Team members; CI, confidence interval; PHQ-2, Patient Health Questionnaire 2; TICS-M, Modified Telephone Interview Cognitive Status.