Table 3. Odds ratios and cumulative risks of lung cancer by age 75, by age at quitting smoking, among men, by country.

Centres	Case/control	ORa	Standarda 95% CI	Floatingb 95% CI	Cumulative riskc (95% CI)
UKd
Nonsmoker	3/400	1.0		0.3–3.1	0.2 (0.01–0.4)
<30 years	6/122	6.6	1.6–26.6	2.9–14.9	1.1 (0.3–1.9)
40 years	12/193	8.3	2.3–29.7	4.6–14.9	2.6 (1.3–3.9)
50 years	44/246	23.8	7.3–77.6	17.3–32.9	5.6 (4.1–7.0)
60 years	223/545	54.6	17.3–171.7	46.7–63.8	11.1 (9.4–12.8)
Current smoker	322/453	94.8	30.2–297.8	82.2–109.3	15.7 (14.4–17.0)
Germany
Nonsmoker	63/763	1.0		0.8–1.3	0.6 (0.4–0.7)
<30 years	27/294	1.03	0.6–1.6	0.7–1.5	0.6 (0.3–0.8)
40 years	52/426	2.8	1.9–3.9	2.2–3.5	1.8 (1.4–2.1)
50 years	169/498	6.8	5.0–9.1	5.9–7.9	4.9 (4.4–5.4)
60 years	804/481	15.0	11.2–20.1	13.0–17.3	10.8 (10.0–11.6)
Current smoker	2342/1039	27.3	20.9–35.6	25.4–29.4	14.3 (13.6–15.0)
Italy
Nonsmoker	18/277	1.0		0.6–1.6	0.6 (0.3–0.9)
<30 years	34/103	5.6	2.9–10.6	3.6–8.6	3.4 (2.0–4.9)
40 years	61/131	4.9	2.7–9.0	3.4–7.2	3.3 (2.1–4.4)
50 years	130/268	8.9	5.2–15.1	7.0–11.3	6.3 (5.1–7.5)
60 years	295/214	12.7	7.6–21.2	10.5–15.4	10.2 (9.1–11.2)
Current smoker	833/539	23.7	14.6–38.7	21.3–26.5	13.8 (12.8–14.8)
Sweden
Nonsmoker	36/706	1.0		0.7–1.4	0.4 (0.2–0.5)
<30 years	4/71	1.1	0.4–3.2	0.4–3.0	0.4 (0.01–0.8)
40 years	14/158	1.7	0.9–3.3	1.0–3.0	0.8 (0.4–1.1)
50 years	46/215	4.2	2.6–6.6	3.1–5.8	2.1 (1.6–2.6)
60 years	199/369	7.2	4.7–10.9	5.7–9.3	4.2 (3.6–4.8)
Current smoker	716/805	17.4	12.3–24.7	15.3–19.3	6.6 (6.2–7.0)

^aOdds ratio and 95% confidence intervals calculated by logistic regression analyses, adjusted for age and centre.

^b95% confidence intervals are based on floating variance.

^cCumulative risk expressed as percentage; 95% confidence intervals are based on floating variance.

^dSee footnote to Table 2 concerning the anomalously high odds ratios for the UK study.