From: Identifying the determinants of premature mortality in Russia: overcoming a methodological challenge
 | Cases narcology registration | Controls narcology registration | ||
---|---|---|---|---|
Surrogate consumption | No | Yes | No | Yes |
No | 904 | 84 | 1,549 | 41 |
Yes | 518 | 199 | 110 | 25 |
Don't know/difficult to answer | 36 | 9 | 20 | 5 |
Chi-square* | 111.14 | 97.78 | ||
p value | <0.001 | <0.001 |