Table 3.

Mean left eye pupil measurements for resting pupil diameter, PLR amplitude, constriction velocity (CV) and pupil latency for brown, green and blue eyes.

	Resting state 1 (left): mean (sd, range)	Left eye amplitude: mean (sd, range)	Left eye CV max: mean (sd, range)	Left eye pupil latency: mean (sd, range)
Brown (n = 57)	5.35 (0.90, 2.55 to 6.76)	1.42 (0.25, 0.76 to 1.99)	−4.21 (0.69, −5.39 to −2.12)	250.27 (24.31, 175 to 325)
Green (n = 43)	5.52 (0.80, 4.18 to 7.58)	1.45 (0.32, 0.47 to 2.21)	−4.29 (0.96, −6.61 to −1.34)	250.90 (31.6, 158 to 359)
Blue (n = 174)	5.21 (0.77, 3.4 to 6.8)	1.35 (0.26, 0.68 to 1.96)	−3.96 (0.81, −5.82 to −1.78)	246.26 (28.30, 188 to 328)
P trend	0.468	0.325	0.669	0.176

No statistical differences between eye colours was identified.