Predictors of purchasing national brands, weighted GEE model (dependent variable=1 if brand of last purchase was national)
| Explanatory variables | OR | 95% CI |
|---|---|---|
| Age (years | ||
| 18 to 24 | 1 | |
| 25 to 39 | 1.51 | 0.98 to 2.32 |
| 40 to 54** | 2.59 | 1.69 to 3.98 |
| 55or more** | 4.27 | 2.72 to 6.72 |
| Sex | ||
| Male | 1 | |
| Female** | 0.59 | 0.45 to 0.76 |
| Education | ||
| Primary graduate or less | 1 | |
| Secondary** | 0.50 | 0.37 to 0.67 |
| High school graduate** | 0.32 | 0.22 to 0.45 |
| College or more** | 0.23 | 0.15 to 0.34 |
| Income | ||
| Low (MX$0 to MX$3000) | 1 | |
| Medium (MX$3001 to MX$5000) | 0.88 | 0.72 to 1.07 |
| High (MX$5001 or more)* | 0.79 | 0.63 to 0.99 |
| Don't know | 0.92 | 0.68 to 1.23 |
| Smoking status | ||
| Less than daily | 1 | |
| Daily, five cigarettes per day or less | 1.22 | 0.98 to 1.53 |
| Daily, more than five cigarettes per day** | 1.68 | 1.34 to 2.11 |
| Waves of participation** | 1.26 | 1.15 to 1.37 |
| Survey wave | ||
| 2008 | 1.11 | 0.95 to 1.30 |
| 2010 | 1 | |
| 2011 | 0.93 | 0.80 to 1.08 |
| Observations | 4601 | |
*p<0.05, **p<0.01.
GEE, generalised estimating equations.