Table 1.
Distribution of all 54 included studies, by NCNP type, country and age grouping. Three studies reported more than one NCNP, and so are counted twice in this table, hence the overall total of 57. Blank cells indicate no studies
| E-cigarettes | Smokeless tobacco | NRT | Total | ||||
|---|---|---|---|---|---|---|---|
| Best Evidence | Other | Best Evidence | Other | Best Evidence | Other | ||
| US | 5 | 8 + 1(YP) | 13 | 7 + 3(YP) | 1 | 38 | |
| Australia | 1 | 1 | |||||
| Canada | 1(YP) | 1 | 2 | ||||
| Ireland | 1(YP) | 1 | |||||
| Italy | 1 | 1 | |||||
| Finland | 1(YP) | 1 | |||||
| France | 1(YP) | 1 | |||||
| Norway | 1 + 2(YP) | 2(YP) | 5 | ||||
| Sweden | 2 | 2 | |||||
| Switzerland | 1 | 1(YP) | 2 | ||||
| UK | 2 | 1 | 3 | ||||
| Total Adults | 7 | 10 | 16 | 7 | 2 | 2 | 44 |
| Total Young People | 0 | 5 | 2 | 6 | 0 | 0 | 13 |
| Total | 7 | 15 | 18 | 13 | 2 | 2 | 57 |