Table 2.

Number of former and current daily smokers, and quit ratio for daily cigarette smoking in seven Norwegian studies.

Study	Former daily smokers	Current daily smokers	Total	Quit ratio (95% CI)
1	1870	1734	3604	51.9 (50.3–53.5)
2	136	287	423	32.2 (27.8–36.7)
3	296	162	458	67.4 (63.1–71.7)
4	1041	975	2016	51.6 (49.4–53.8)
5	318	411	729	43.6 (40.0–47.2)
6	328	311	639	51.3 (47.4–55.2)
7	1155	1417	2572	44.9 (43.0–46.8)
Total	5144	5297	10441

CI: confidence interval.