Table 3.

Notch prevalence (%) and adjusted PR for both ears in dental and non-dental students^*,†

	Right ear			Left ear
	Dental students	Non-dental students	Prevalence Ratio (95% CI)	Dental students	Non-dental students	Prevalence Ratio (95% CI)
3 kHz	5.31	1.67	3.18	2.6	3.36	0.77
			(0.88–11.46)			(0.20–2.93)
4 kHz	6.84	3.99	1.72	14.08	5.45	2.58
			(0.66–4.49)			(1.28–5.21)§
6 kHz	9.23	3.28	2.82	7.07	2.36	2.99
			(1.11–7.12)‡			(1.01–8.97)‡

PR, prevalence ratios. ^*Adjusted by gender and age. All results are similar when using a generalized linear model with link log and binomial family. ^†The transform-the-endpoints method was used. ^‡P < 0.05, ^§P < 0.01