1. Table 2. In this analysis NO2 SO2 and data on tobacco consumption are not avail
2. the product N2x SO2 were used inde- able. If we can obtain such data we can use
3. pendently as the exposure measure xj in them for adjustment. But practically
4. Equation 2. When NO2 was used as the speaking it will be unlikely that the ward
5. exposure measure a significant association specific tobacco consumption is strongly