Respiratory Symptoms due to Occupational Exposure to Formaldehyde and MDF Dust in a MDF Furniture Factory in Eastern Thailand

Table 1

Work history.

Variables	Formaldehyde exposed group (ppm)			Total; (%)	MDF dust exposed group (mg/m^3)			Total; (%)
	Low; (0.66–3.44)	Moderate; (3.45–6.89)	High; (>6.89)		Low; 1.71–3.18	Moderate; (3.19–6.37)	High; (>6.37)
Department
Office	116 (31.1)	0 (0)	0 (0)	116 (26.4)	116 (100)	0 (0)	0 (0)	116 (26.4)
Combination	39 (10.5)	0 (0)	0 (0)	39 (8.9)	0 (0)	0 (0)	39 (20.5)	39 (8.9)
Edging	51 (13.7)	0 (0)	0 (0)	51 (11.6)	0 (0)	51 (38.3)	0 (0)	51 (11.6)
Fitting	34 (9.1)	0 (0)	0 (0)	34 (7.4)	0 (0)	0 (0)	34 (17.9)	34 (7.4)
Clearing	0 (0)	0 (0)	22 (100)	22 (5)	0 (0)	0 (0)	22 (11.6)	22 (5)
Drilling	50 (13.4)	0 (0)	0 (0)	50 (11.41)	0 (0)	0 (0)	50 (26.3)	50 (11.41)
Laminating	0 (0)	27 (61.4)	0 (0)	27 (6.2)	0 (0)	27 (20.3)	0 (0)	27 (6.2)
Wrapping	28 (7.5)	0 (0)	0 (0)	28 (6.4)	0 (0)	0 (0)	28 (14.7)	28 (6.4)
Packing	55 (14.7)	0 (0)	0 (0)	55 (12.5)	0 (0)	55 (41.4)	0 (0)	55 (12.5)
Line	0 (0)	17 (38.6)	0 (0)	17 (3.9)	0 (0)	0 (0)	17 (8.9)	116 (26.4)
Work duration (yrs)
<1	48 (12.9)	9 (20.9)	2 (9.1)	59 (13.5)	10 (8.6)	22 (16.7)	27 (14.4)	59 (13.5)
1-2	14 (3.8)	1 (2.3)	0 (0)	15 (3.4)	6 (5.2)	4 (3)	5 (2.7)	15 (3.4)
3–5	48 (12.9)	0 (14)	2 (9.1)	56 (12.8)	18 (5.5)	17 (12.9)	2 (11.2)	56 (12.8)
6–10	11 (25.6)	4 (18.2)	4 (18.2)	124 (28.4)	57 (31.9)	27 (28)	50 (26.6)	124 (28.4)
>10	16 (37.2)	16 (37.2)	14 (63.6)	182 (41.7)	45 (38.8)	52 (39.4)	85 (45.2)	182 (41.7)
Overtime work (hour/week)
1–6	267 (71.6)	40 (90.9)	22 (100)	329 (74.9)	107 (92.2)	95 (71.4)	127 (66.8)	329 (75.9)
>6	106 (28.4)	4 (9.1)	0 (0)	110 (25.1)	9 (7.8)	38 (28.6)	127 (66.8)	110 (25.1)
PPE use	215 (57.6)	37 (84.1)	20 (90.9)	272 (62)	27 (23.3)	100 (75.2)	145 (76.3)	272 (62.0)