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. 2018 May 7;20(5):e175. doi: 10.2196/jmir.9909

Table 6.

Site use-related predictors of patient-perceived health benefits in the Impact Survey: univariate and multivariate models. Ref: reference group.

Independent variables Univariate models Multivariate models

Dependent variable: total number of benefits (out of 15) Dependent variable: total number of benefits (out of 15) Benefits related to knowledge/understanding of one’s condition (out of 7) Benefits related to treatment/management of one’s condition (out of 8)

β P RRa β P RRa RR RR
Age (years)b








18-39 0.12 <.001 1.13 -0.02 0.10 0.98 1.00 0.97

40-55 0.09 <.001 1.10 -0.14 <.001 1.12 0.91 0.85

≥55 0 Ref 0 Ref Ref Ref
Gender








Male 0 Ref 0 Ref Ref Ref

Female 0.07 <.001 1.08 0.07 <.001 1.07 1.04 1.16
Tenure at baselinec 0.02 <.001 1.02 0.02 <.001 1.02 1.02 1.02
Community customization








None 0 Ref 0 Ref Ref Ref

Customized 0.16 <.001 1.17 0.19 <.001 1.21 1.24 1.13
Patient activation








Level 1 0 Ref 0 Ref Ref Ref

Level 2 0.15 <.001 1.16 0.14 <.001 1.15 1.21 1.06

Level 3 0.21 <.001 1.24 0.21 <.001 1.23 1.32 1.12

Level 4 0.25 <.001 1.29 0.25 <.001 1.29 1.42 1.13
Sessions








Low engagement 0 Ref 0 Ref Ref Ref

Mod-high engagement 0.13 <.001 1.14 0.10 <.001 1.11 1.05 1.19
Condition grouping








Cardiovascular and metabolic diseases 0.04 .10 1.04 0.18 <.001 1.19 1.22 1.07

Infectious disease –0.09 .08 0.91 –0.09 .08 0.91 0.87 0.98

Inflammation and autoimmunity –0.04 .03 0.96 –0.01 .52 0.99 1.03 0.89

Mental and behavioral health 0.07 <.001 1.07 0.05 .002 1.05 1.03 1.05

Neurologic 0.07 <.001 1.07 0.01 .58 1.01 1.08 0.89

Oncology –0.19 <.001 0.82 –0.07 .006 0.93 1.03 0.74

Respiratory 0.05 .07 1.05 0.10 .002 1.10 1.15 1.03

Other 0 Ref 0 Ref Ref Ref

aRelative risk (RR) greater than 1 represents a greater chance (“risk”) of an additional benefit compared to the reference category.

bRepresentation of the survey population in the category 18-24 years was quite low (2%) and thus was combined with the category 25-39 years to create the 18-39 years category. As seen in Table 1, the mean age in the population was 54.

cTenure at baseline variable converted to years (from days) for interpretation purposes.