Table 3.
The effect of user characteristics on measures of engagement (number of days used and % of screens viewed).
| User characteristics | Days used, median (IQRa) | Unadjusted simple linear regression | Adjustedb multiple regression | Screens viewed, % mean (SD) | Unadjusted simple linear regression | Adjustedb multiple regression | ||||||
| Bc (95% CI) | P value | B (95% CI) | P value | B (95% CI) | P value | B (95% CI) | P value | |||||
| Age (years) | —d | .02 (0.01 to 0.03) | <.001 | .02 (0.02 to 0.03) | <.001 | — | .25 (0.16 to 0.34) | <.001 | .28 (0.19 to 0.38) | <.001 | ||
| Gender | ||||||||||||
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Male (reference; n=295) | 4 (2 to 11) | — | — | — | — | 37.7 (13.54) | — | — | — | — | |
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Female (n=377) | 5 (2 to 13) | .12 (−0.05 to 0.30) | .16 | .10 (−0.07 to 0.27) | .25 | 40.0 (13.54) | 2.29 (0.27 to 4.32) | .03 | 1.99 (0.01 to 3.97) | .049 |
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| Employment status | ||||||||||||
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Unemployed (reference; n=91) | 3 (1 to 11) | — | — | — | — | 38.6 (13.97) | — | — | — | — | |
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Employed (n=581) | 4 (2 to 13) | .16 (−0.09 to 0.41) | .22 | .18 (−0.08 to 0.43) | .17 | 39.0 (13.22) | .37 (−2.58 to 3.32) | .80 | .07 (−2.88 to 3.02) | .96 | |
| Ethnicity | ||||||||||||
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White (reference; n=640) | 4 (2 to 13) | — | — | — | — | 39.1 (13.29) | — | — | — | — | |
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Not white (n=32) | 4 (1 to 13) | −.13 (−0.54 to 0.27) | .52 | −.04 (−0.44 to 0.36) | .83 | 36.9 (13.84) | −2.12 (−6.86 to 2.61) | .38 | −1.48 (−6.16 to 3.19) | .53 |
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| Education | ||||||||||||
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Pre-16 years (reference; n=188) | 3 (1 to 9) | — | — | — | — | 36.7 (13.27) | — | — | — | — | |
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Post-16 years (n=484) | 5 (2 to 14) | .23 (0.04 to 0.42) | .02 | .28 (0.10 to 0.47) | .003 | 39.8 (13.24) | 3.15 (0.91 to 5.38) | .006 | 4.04 (1.85 to 6.24) | <.001 |
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| Current smoker | ||||||||||||
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Yes (reference; n=165) | 3 (1 to 12) | — | — | — | — | 37.8 (12.72) | — | — | — | — | |
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No (n=507) | 5 (2 to 13) | .20 (0 to 0.39) | .05 | .02 (−0.02 to 0.01) | .85 | 39.4 (13.49) | 1.57 (−0.77 to 3.91) | .19 | −.05 (−2.40 to 2.30) | .97 | |
| Past week alcohol consumption (units)e | — | 0 (–0.01 to 0) | .33 | 0 (0) | .42 | — | 0 (−0.04 to 0.04) | .98 | 0 (−0.03 to 0.04) | .87 | ||
| Alcohol use (AUDITf score) | — | −.01 (−0.02 to 0) | .13 | −.01 (−0.02 to 0.01) | .28 | — | 0 (−0.15 to 0.16) | .99 | .02 (−0.13 to 0.17) | .82 | ||
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aIQR: interquartile range.
bAdjusted for all sociodemographic variables, AUDIT score, and treatment group (unless otherwise specified).
cUnstandardized regression coefficient.
dNot applicable.
eAdjusted for all sociodemographic variables and treatment group (not AUDIT score).
fAUDIT: Alcohol Use Disorders Identification Test.