Table 3.
Construct | Odds ratio (95% CI) | |||||
TPBa | Extended TPB | Extended TPB and subjective numeracy |
Extended TPB and subjective literacy |
Extended TPB and objective numeracy |
Extended TPB and objective literacyb |
|
Attitude | 13.38 (6.40-27.90) |
9.16 (4.02-20.85) |
9.13 (4.00-20.84) |
9.26 (4.06-21.11) |
9.58 (4.14-22.12) |
N/Ac |
Subjective norm | 3.64 (2.33-5.70) |
0.91 (0.51-1.61) |
0.91 (0.51-1.61) |
0.90 (0.50-1.60) |
0.89 (0.50-1.59) |
N/A |
Perceived control | 2.36 (1.43-3.90) |
1.69 (0.92-3.08) |
1.68 (0.91-3.09) |
1.75 (0.95-3.22) |
1.65 (0.89-3.03) |
N/A |
Anticipated regret | N/A | 2.43 (1.71-3.46) |
2.44 (1.70-3.48) |
2.33 (1.61-3.36) |
2.47 (1.73-3.52) |
N/A |
Descriptive norm | N/A | 2.83 (1.63-4.92) |
2.83 (1.63-4.92) |
2.82 (1.62-4.90) |
2.84 (1.64-4.93) |
N/A |
Moral norm | N/A | 7.97 (4.49-14.14) |
7.97 (4.49-14.15) |
8.38 (4.65-15.06) |
7.92 (4.46-14.08) |
N/A |
Health literacyd | N/A | N/A | 1.02 (0.58-1.81) |
0.78 (0.43-1.43) |
1.18 (0.66-2.12) |
N/A |
Deviance | 316.78 | 358.11 | 358.10 | 357.48 | 357.80 | N/A |
∆ deviance |
|
41.33 | 0.01 | 0.63 | 0.31 | N/A |
P value |
|
<.001 | .92 | .43 | .58 | N/A |
aTPB: Theory of Planned Behavior.
bObjective literacy could not be added to the regression model because of the lack of variability in the distribution.
cN/A: not applicable.
dSubjective numeracy: score≥ median versus score < median; subjective health literacy: adequate versus inadequate; objective numeracy: all correct answers versus one error or more.