TABLE 1.

Univariate and multivariate logistic regression analyses of risk variables for abnormal chest computed tomography (CT) scan and overall impact in patients with chronic cough

	Univariate analysis			Multivariate analysis
	OR	95% CI	p-value	OR	95% CI	p-value
Abnormal chest CT scan #
Age <40 years	0.30	0.10–0.71	0.013	0.19	0.01–1.17	0.13
Female	0.87	0.56–1.37	0.55	0.84	0.52–1.38	0.49
Active or former smokers	1.39	0.90–2.13	0.13	1.34	0.85–2.1	0.21
Cough duration ≤1 year	0.77	0.48–1.23	0.26	0.83	0.51–1.37	0.45
Dry cough	0.33	0.21–0.52	<0.0001	0.34	0.21–0.55	<0.0001
Nocturnal cough	1.00	0.66–1.51	0.99	1.00	0.65–1.55	0.99
Age <40 years and dry cough	0.28	0.08–0.71	0.017	1.87	0.21–41.20	0.61
Overall impact ¶
Female	0.50	0.21–1.19	0.11	0.42	0.17–1.06	0.06
Active or former smokers	1.33	0.54–3.09	0.52	1.16	0.46–2.80	0.74
Cough duration ≤1 year	0.93	0.38–2.63	0.88	1.05	0.41–3.10	0.92
Dry cough	0.46	0.20–1.14	0.08	0.49	0.21–1.22	0.11
Nocturnal cough	1.54	0.65–3.88	0.34	1.57	0.66–4.01	0.32

No patients aged <40 years had an overall impact of chest CT scan. For this reason, no statistical analysis has been made for this category of patients. Bold font indicates statistical significance. ^#: number of patients was 145 out of 595 (24.4%); ^¶: number of patients was 30 out of 595 (5.0%).