Radiological surveillance of formerly asbestos-exposed power industry workers: rates and risk factors of benign changes on chest X-ray and MDCT

Table 4 Changes on MDCT: results of multiple logistic regression model (n = 196, odds ratios with 95% confidence interval, p-values of Wald test)

		Age	TSFE^e	Exposure duration	Cumulative exposure (fibre years)		Pack years
		(years)	(years)	(years)	>1 & <25 vs. ≤ 1^b≥25 vs. ≤1^c
	Model ^a	OR ^d / CI	OR ^d / CI	OR ^d / CI	OR / CI	OR / CI	OR ^d / CI
		p	p	p	p	p	p
Any changes	m1	1.53 / 0.94-2.50	-	-	1.99 / 0.87-4.51	2.54 / 1.12-5.76	1.06 / 0.95-1.18
n = 118 (60.2 %)		0.0885			0.1015	0.0255	0.3024
	m2	-	1.54 / 1.02-2.31	-	1.94 / 0.85-4.43	2.12 / 0.92-4.89	1.06 / 0.95-1.18
			0.0398		0.1149	0.0779	0.2980
	m3	-	-	1.47 / 0.98-2.22	2.00 / 0.88-4.56	2.13 / 0.92-4.92	1.05 / 0.94-1.17
				0.0636	0.0980	0.0768	0.3736
Asbestosis	m1	2.13 / 1.11-4.07	-	-	1.68 / 0.56-5.07	1.27 / 0.41-3.91	1.15 / 1.02-1.30
n = 40 (20.4 %)		0.0228			0.3594	0.6808	0.0244
	m2	-	1.58 / 0.95-2.62	-	1.68 / 0.56-5.06	1.06 / 0.34-3.31	1.14 / 1.01-1.29
			0.0784		0.3546	0.9207	0.0343
	m3	-	-	1.09 / 0.66-1.81	1.85 / 0.62-5.52	1.25 / 0.40-3.90	1.14 / 1.01-1.28
				0.7257	0.2675	0.6998	0.0394
Plaques	m1	1.52 / 0.93-2.47	-	-	1.45 / 0.64-3.28	2.54 / 1.12-5.76	1.05 / 0.95-1.17
n = 112 (57.1 %)		0.0939			0.3724	0.0253	0.3491
	m2	-	1.61 / 1.07-2.41	-	1.40 / 0.62-3.19	2.09 / 0.90-4.82	1.05 / 0.95-1.17
			0.0225		0.4235	0.0847	0.3440
	m3	-	-	1.55 / 1.03-2.33	1.45 / 0.64-3.29	2.09 / 0.90-4.83	1.04 / 0.94-1.16
				0.0368	0.3752	0.0846	0.4329

^am1 = model with age, m2 = model with latency, m3 = model with years of exposure.
^bgroup with >1 and < 25 fibre years versus group with ≤ 1 fibre years.
^cgroup with ≥ 25fibre years versus group with ≤ 1 fibre years.
^dodds ratio for an increase of 10 years (continuous variables).
^etime since first exposure.

ISSN: 1745-6673