Symptoms of respiratory tract infection and associated care-seeking in subjects with and without obstructive lung disease; The Tromsø Study: Tromsø 6

Table 3 Predictors of self-reported symptoms of airway infection the previous seven days (n = 763), and that had started within the previous seven days (n = 319), evaluated by multivariable logistic regression in 5943 middle-aged and elderly adults taking part in the Tromsø 6 survey

	RTI symptoms previous week			RTI symptoms that started within previous week
	Odds ratio	95% confidence interval	p-value	Odds ratio	95% confidence interval	p-value
Male gender	1.06	0.90 - 1.24	0.5	1.13	0.90 - 1.43	0.3
Age (years)^# : 55-64	0.95	0.76 - 1.17	0.6	0.67	0.50 - 0.90	0.008
65-74	0.94	0.74 - 1.19	0.6	0.77	0.56 - 1.06	0.1
75 +	0.49	0.35 - 0.68	<0.001	0.35	0.21 - 0.57	<0.001
Smoking ^& : current	1.60	1.29 - 1.98	<0.001	1.12	0.82 - 1.54	0.5
previous	0.99	0.82 - 1.19	0.9	0.80	0.61 - 1.03	0.09
Self-rated health, bad , or neither good or bad	1.30	1.11 - 1.53	0.001	1.12	0.88 - 1.42	0.4
Self-reported disease: Asthma, not COPD^£	1.22	0.93 - 1.62	0.2	1.22	0.81 - 1.85	0.3
COPD, not asthma^£	0.97	0.60 - 1.55	0.9	0.72	0.29 - 1.81	0.5
Both asthma and COPD^£	1.06	0.65 - 1.64	0.8	1.33	0.63 - 2.81	0.5
Cardiovascular disease	0.91	0.73 - 1.13	0.4	0.79	0.56 - 1.12	0.2
Spirometry ^$ : GOLD 1 spirometry	1.08	0.83 - 1.40	0.6	0.72	0.46 - 1.13	0.2
GOLD 2–4 spirometry	1.48	1.17 - 1.87	0.001	0.89	0.60 - 1.33	0.6
Winter season	1.27	1.09 - 1.50	0.002	1.15	0.92 - 1.45	0.2

The area under curve for the two models were 0.60 (0.58-0.62) and 0.60 (0.57-0.63), respectively.
^# Age 38–54 years is reference category.
^& Never smoking is reference category.
^£ Asthma or COPD not reported is reference category.
^$ FEV1/FVC ≥ 0.7 is reference category.

ISSN: 1471-2466