Table 3. Multivariable regression analysis: Adjusted Odds Ratios after controlling for confounding of relationship between independent variables, "Age" and "Level of income", and outcome "Willingness to receive SMS".
| Adjusted OR Willingness to receive SMS (95% CI, two-tailed)* | P-value* | |||
|---|---|---|---|---|
| Age (years) of respondents** | - | - | ||
| Younger than 40 | 1.00 (reference group) | |||
| 40–49 | 3.71 (0.74–18.70) | 0.11 | ||
| 50–59 | 2.37 (0.47–11.98) | 0.30 | ||
| 60–69 | 3.71 (0.55–25.02) | 0.18 | ||
| 70–79 | 0.91 (0.12–6.80) | 0.93 | ||
| Older than 80 | 0.15 (0.01–1.51) | 0.11 | ||
| Level of income*** | ||||
| Less than 1,000 | 1.00 (reference group) | |||
| 1,000 to 2,499 | 0.58 (0.14–2.36) | 0.44 | ||
| 2,500 to 4,999 | 2.70 (0.51–14.30) | 0.24 | ||
| 5,000 to 7,499 | 5.00 (0.49–50.63) | 0.17 | ||
| 7,500 or greater | 3.45 (0.34–35.30) | 0.30 |
*P values represent results of Wald test for the Odds Ratios comparing individual levels to baseline ("reference") group within each variable
**Odds Ratios for Age after controlling for level of income
***Odds Ratios for Level of Income after controlling for Age