Table 2.  .

The Median (and 25^th and 75^th Percentiles) of Bias (Measure of Accuracy) and Derivative of Nonlinear Function at t_COG (Measure of Precision) Values Measured in Each Subject Group

Subject Group	Street-Crossing Decision Outcome Variable
	Bias, s	Derivative of Non-Linear Function at tCOG
Young normally sighted	1.14 (0.45, 1.68)	0.62 (0.50, 0.79)
Old normally sighted	0.36 (−0.27, 0.70)	0.57 (0.35, 0.76)
AMD	0.29 (−0.30, 0.86)	0.59 (0.48, 0.82)

t_COG, the time in seconds at which the subject's response transitions from “not enough time to cross” to “enough time to cross.”²⁵