Table 3. Correlation between Williams test (Y-226 Hz) and sonotubometry

	Positive Williams test	Negative Williams test	Sonotubometry duration time	Sonotubometry elevation	Sonotubometry dimension
Positive Williams test		.752†	.295†	.371†	.271*
Negative Williams test	.752†		.305†	.327†	.285*
Sonotubometry duration time	.295†	.305†		.837†	.892†
Sonotubometry elevation	.371†	.327†	.837†		.838†
Sonotubometry dimension	.271*	.285*	.892†	.892†

p<0.05,
p<0.01.