Screening for tuberculosis and prediction of disease in Portuguese healthcare workers

Table 4 Concordant and discordant tuberculin skin test (TST) of ≥ 10 mm and interferon-γ release assay (IGRA) results depending on putative risk factors

	TST/IGRA
	Neg./Neg.		Pos./Neg.		Neg./Pos.		Pos./Pos.		P
Age	N	%	n	%	n	%	n	%	<0.001
< 25 years	70	23.3	174	57.8	8	2.7	49	16.3
25-29 years	258	31.4	359	43.7	31	3.8	173	21.1
30-39 years	203	25.7	322	40.7	35	4.4	231	29.2
40-49 years	93	17.4	222	41.6	17	3.2	202	37.8
≥ 50 years	55	12.6	175	40.0	12	2.7	195	44.6
Gender
Female	508	24.6	902	43.6	73	3.5	585	28.3
Male	171	21.0	350	42.9	30	3.7	265	32.5	0.078
BCG vacci.
At birth	183	20.0	328	35.8	34	3.7	372	40.6
Plus one additional	245	24.0	447	43.7	36	3.5	294	28.8
Plus two	178	26.8	320	48.3	25	3.8	140	21.1
Plus 3-10	73	25.9	157	55.7	8	2.8	44	15.6	<0.001
Profession
Administrator	72	18.6	160	41.2	14	3.6	142	36.6
Auxiliaries, cleaning	133	27.3	174	35.7	19	3.9	161	33.1
Technicians (radiology, lab, etc.)	27	15.9	89	52.4	6	3.5	48	28.2
Nurses	302	25.1	585	48.6	38	3.2	279	23.2
Physicians	145	22.8	244	38.4	26	4.1	220	34.6	<0.001
Risk
Low	27	13.1	94	45.6	3	1.5	82	39.8
Moderate	378	22.0	795	46.2	55	3.2	494	28.7
High	274	28.7	363	38.0	45	4.7	274	28.7	<0.001
Years in healthcare
Start of work	96	24.0	192	48.0	15	3.8	97	24.3
< 1 years	51	36.2	64	45.4	6	4.3	20	14.2
1-5 years	248	31.5	328	41.7	37	4.7	174	22.1
> 5-10 years	124	26.7	187	40.2	17	3.7	137	29.5
10-20 years	103	18.0	258	45.0	16	2.8	196	34.2
≥ 20 years	57	11.0	223	43.1	12	2.3	226	43.6	<0.001

ISSN: 1745-6673