High Salt Intake and Risk of Chronic Bronchitis: The Copenhagen Male Study—A 10-Year Followup

Table 4

Prospective analysis 1976–1986 including only men who in 1976 had no lung symptoms indicating bronchitis, 𝑛=2,183 according to self-assessed salt intake in 1976 and 1985-6 and smoking characteristics. Various forced entry multiple logistic regression analyses using different adjustment criteria.

	Low/Low	High/Low	Low/High	High/High
All men, n = 2,183	Self-assessed salt intake in 1976 and 1986, respectively
𝑁	1582	333	63	176
Crude CB incidence, %	5.8%	7.2%	14.3%	15.9%
Odds ratio, adjustment for:
(1) age	1^a	1.25 (0.78–1.99)	2.81 (1.34–5.88)**	3.08 (1.95–4.86)***
(2) + smoking 1976	1^a	1.19 (0.74–1.90)	2.89 (1.37–6.10)**	2.76 (1.74–4.39)***
(3) + occupational dust exp.	1^a	1.19 (0.74–1.92)	3.02 (1.41–6.45)**	2.85 (1.78–4.55)***
(4) + social class	1^a	1.21 (0.75–1.95)	3.15 (1.47–6.77)**	2.84 (1.77–4.53)***
Smokers in both 1976 and 1985-6,; n = 984	Self-assessed salt intake in 1976 and 1986, respectively
𝑁	683	161	29	111
Crude CB incidence, %	8.8%	9.3%	20.7%	21.6%
Odds ratio, adjustment for:
(1) age	1^a	1.08 (0.59–1.96)	3.03 (1.18–7.83)*	2.92 (1.73–4.94)***
(2) + occupational dust exp.	1^a	1.03 (0.56–1.89)	2.96 (1.14–7.71)*	2.97 (1.74–5.06)***
(3) + social class	1^a	1.05 (0.57–1.92)	3.02 (1.16–7.89)*	2.97 (1.74–5.07)***

^a: reference category *: 𝑃<0.05; **: 𝑃<0.01; ***: 𝑃<0.001.