Misclassification and characterization of exposure to humidifier disinfectants using a questionnaire

BMC Public Health

Table 1 Social and demographic characteristics according to clinical classification

Characteristics	Class 1		Class 2		Class 3		Class 4		Indetermination		Total		p-value
Characteristics	N	(%)	N	(%)	N	(%)	N	(%)	N	(%)	N	(%)	p-value
Total	4351	83.0	281	5.4	204	3.9	264	5.0	145	2.8	5245	100.0
Sex													< 0.01
Male	2285	85.4	113	4.2	89	3.3	146	5.5	70	2.6	2675	100.0
Female	2063	81.0	168	6.6	115	4.5	118	4.6	55	2.2	2547	100.0
Unknown	3	13.0	0	0.0	0	0.0	0	0.0	20	87.0	23	100.0
Survival status													< 0.01
Survival	3479	86.4	215	5.3	133	3.3	72	1.8	72	1.8	4027	100.0
Death	872	71.6	66	5.4	71	5.8	73	6.0	73	6.0	1218	100.0
Age at damage (years)													< 0.01
< 10	1088	70.8	142	9.2	106	6.9	145	9.4	55	3.6	1536	100.0
10s	117	91.4	3	2.3	1	0.8	3	2.3	4	3.1	128	100.0
20s	299	89.0	10	3.0	8	2.4	12	3.6	7	2.1	336	100.0
30s	755	82.3	41	4.5	33	3.6	72	7.9	16	1.7	917	100.0
40s	467	91.2	20	3.9	12	2.3	6	1.2	7	1.4	512	100.0
50s	501	91.3	18	3.3	14	2.6	8	1.5	8	1.5	549	100.0
60s	459	91.8	18	3.6	12	2.4	4	0.8	7	1.4	500	100.0
70s	240	92.7	12	4.6	3	1.2	1	0.4	3	1.2	259	100.0
≥ 80	53	94.6	1	1.8	0	0.0	0	0.0	2	3.6	56	100.0
Unknown	372	82.3	16	3.5	15	3.3	13	2.9	36	8.0	452	100.0
Susceptible group													< 0.01
Pregnant women	261	77.0	10	3.0	18	5.3	44	13.0	6	1.7	339	100.0
Fetus	311	70.8	42	9.6	30	6.8	17	3.9	39	8.9	439	100.0
Others	3779	84.6	229	5.1	156	3.5	203	4.6	100	2.2	4467	100.0

ISSN: 1471-2458