Table 1. Studies showing a significant positive correlation between audio device usage and NIHL (1985-2010).

NIHL = noise-induced hearing loss

Sr. No.	Year of Study	Author
1	1985 (pilot study)	Lee et al. [14]
2	1985	Catalano et al. [15]
3	1999	Zenner et al. [18]
4	2007	Peng et al. [20]
5	2009	Vogel et al. [22,23]
6	2010	McNeill et al. [25]