Table 1.

Detection times when listening in quiet.

Listening conditions	Total trials	Range of detection times (in seconds)	Average (SDs in parentheses) detection time (in seconds)	Average (SDs in parentheses) safety margin (in seconds)	Median safety margin (in seconds)
Straight	144	7–35	13.79 (4.67)	6.79 (4.67)	6.00
Baffle	50	5–32	13.34 (5.73)	6.34 (5.73)	5.00
Severe bend	60	4–19	7.62 (3.11)	0.62 (3.11)	0.00
Minor bend	39	4–28	11.08 (4.93)	4.08 (4.93)	3.00
Hill	43	4–20	9.51 (3.56)	2.51 (3.56)	3.00
Treed approach	24	7–26	11.25 (4.40)	4.25 (4.40)	3.50