Socioeconomic inequality in the use of prescription medications for smoking cessation among patients with COPD: a nationwide study

Figures & data

Table 1 Proportion and corresponding OR with 95% CI of claiming any prescription for either bupropion or varenicline within 6 months from first outpatient visit for COPD according to baseline characteristics

Sociodemographic characteristics	Any SCM	Crude	Confounder adjusted	+Mediator adjusted
	n/N (%)	OR (95% CI)	OR (95% CI)
Age (years)*
>70	45/1,536 (3)	1 (ref)	1 (ref)	1 (ref)
50–69	139/2,272 (6)	2.16 (1.53–3.04)	2.21 (1.58–3.12)	1.85 (1.28–2.67)
30–49	19/357 (5)	1.86 (1.08–3.23)	1.90 (1.10–3.30)	2.01 (1.13–3.57)
Sex‡
Male	83/2,019 (4)	1 (ref)	1 (ref)	1 (ref)
Female	119/2,143 (6)	1.37 (1.03–1.83)	1.40 (1.05–1.86)	1.39 (1.03–1.89)
Ethnicity§
Danish origin	199/4,008 (5)	1 (ref)	1 (ref)	1 (ref)
Other origin	3/154 (2)	0.39 (0.12–1.20)	0.35 (0.11–1.12)	0.44 (1.14–1.43)
Education║
Elementary school	100/2,257 (4)	1 (ref)	1 (ref)	1 (ref)
High school	72/1,468 (5)	1.11 (0.82–1.52)	1.08 (0.79–1.48)	1.01 (0.72–1.41)
University	25/290 (9)	2.04 (1.29–3.21)	2.03 (1.28–3.22)	1.79 (1.09–2.96)
Income¶
Low	38/1,339 (3)	1 (ref)	1 (ref)	1 (ref)
Medium	69/1,349 (5)	1.85 (1.23–2.76)	1.59 (1.05–2.41)	1.49 (0.98–2.28)
High	89/1,326 (7)	2.46 (1.67–3.63)	1.91 (1.26–2.90)	1.68 (1.09–2.60)
Cohabitation#
Cohabitating	112/2,022 (6)	1 (ref)	1 (ref)	1 (ref)
Living alone	90/2,137 (4)	0.75 (0.56–1.00)	0.76 (0.56–1.04)	0.73 (0.53–1.00)
GOLD 1–4**
1	7/273 (3)	0.43 (0.20–0.94)	0.39 (0.18–0.86)
2	87/1,844 (5)	0.81 (0.60–1.11)	0.77 (0.56–1.07)
3	82/1,426 (6)	1 (ref)	1 (ref)
4	22/497 (4)	0.76 (0.47–1.23)	0.84 (0.51–1.37)	n/a
Previous SCM**
No	3,334/4,165 (80)	1 (ref)	1 (ref)
Yes	831/4,165 (20)	3.54 (2.65–4.72)	3.21 (2.37–4.35)

Notes: Adjustments:

* confounders: sex and ethnicity. Mediators: +education, income, cohabitation, and COPD severity;

‡ confounders: age and ethnicity. Mediators: +education, income, cohabitation, and COPD severity;

§ confounders: sex and age. Mediators: +education, income, cohabitation, and COPD severity;

║ confounders: age, sex and ethnicity. Mediators: +income, cohabitation, and COPD severity;

¶ confounders: age, sex, ethnicity and education. Mediators: +cohabitation and COPD severity;

# confounders: confounders: age, sex, ethnicity, education, and income. Mediators: +COPD severity;

** confounders: age, sex, ethnicity, education, income, and cohabitation. No mediators.

Abbreviations: OR, odds ratio; GOLD, The Global Initiative for Chronic Obstructive Lung Disease; SCM, smoking cessation medication; ref, reference; n/a, not applicable.