Table 3. Difference between bleaching treatments.

			FACULTY				Total
			Dental Medicine	Medicine	Economics	Civil Engineering
	Over the counter products	freq.	2	6	11	13	32
		%	5.3%	15.0%	27.5%	32.5%	20.3%
	In-office treatment	freq.	36	34	29	27	126
		%	94.7%	85.0%	72.5%	67.5%	79.7%
Total		freq.	38	40	40	40	158
		%	100.0%	100.0%	100.0%	100.0%	100.0%
Chi-Square Tests
	Value	df
Pearson Chi-Square	10.985a	3