Table 4.

Descriptions of knowledge and perception regarding noise and hearing protection among the hearing impairment

Factors	Low Score n (%)	High Score n (%)
(a) inverse marks
Noise knowledge
Exposure to high-noise levels can be dangerous for my hearing	5 (10.2)	44 (89.8)
Any high-noise level can be dangerous	4 (8.2)	45 (91.8)
It is not needed to use HPD in my workplace (a)	15 (30.6)	34 (69.4)
Noise can permanently affect my hearing	1 (2.0)	48 (98.0)
Noise in my workplace is not dangerous (a)	23 (46.9)	26 (53.1)
Total Scores	13 (26.5)	36 (73.5)
Risk Source perception
Any high-level noise at a very close distance	14 (28.6)	35 (71.4)
Loud music	9 (18.4)	40 (81.6)
Very noisy machine	33 (67.3)	16 (32.7)
Noisy machines in maintenance	27 (55.1)	22 (44.9)
Traffic noise	42 (85.7)	7 (14.3)
Noise with misplaced HPD	29 (59.2)	20 (40.8)
Total Scores	31 (63.3)	18 (36.7)
HPD knowledge
There are several types of HPD	18 (36.7)	31 (63.3)
All HPDs offer the same protection (a)	43 (87.8)	6 (12.2)
Protection depends on the duration of HPD use each day	14 (28.6)	35 (71.4)
I often avoid myself being exposed to noise	21 (42.9)	28 (57.1)
It is possible to reduce noise levels in my workplace	32 (65.3)	17 (34.7)
Total Scores	40 (81.6)	9 (18.4)
HPD perception
When I use HPD , I cannot talk to my colleagues (a)	35 (71.4)	14 (28.6)
HPD do not allow me to hear useful sounds (a)	28 (57.1)	21 (42.9)
When I use HPD , I feel that I am not protected enough (a)	24 (49.0)	25 (51.0)
I exactly know how to correctly use my HPD	15 (30.6)	34 (69.4)
I cannot always use HPD as it should be used (a)	26 (53.1)	23 (46.9)
I know a better way to use HPD	24 (49.0)	25 (51.0)
I make all efforts to have my HPD always well fitted	12 (24.5)	37 (75.5)
I am sure that I use HPD in an efficient way	9 (18.4)	40 (81.6)
Total Scores	38 (77.6)	11 (22.4)