Table 1. Descriptive statistics of the groups according to age and time of exposure to noise and solvents (n = 198).

Groups	Age (y)				Time of exposure (y)
	Average	SD	Minimum	Maximum	Average	SD	Minimum	Maximum
NG	39.3	10.3	20.0	65.0	9.0	6.5	2	35
NSG	38.7	8.9	22.0	60.0	9.2	5.8	2	32

Abbreviations: NG, noise group; NSG, noise and solvent group; SD, standard deviation.