Table 2.

Postural sway length for H₂S exposure concentration groups [ppm (mean ± SD)].

	Sway length (cm)
	0.05 ppm		0.5 ppm		5 ppm
Test condition	Preexposure	Exposure	Preexposure	Exposure	Preexposure	Exposure
Eyes open	30.98 ± 6.76	30.81 ± 6.67	31.20 ± 7.64	32.06 ± 11.17	30.40 ± 6.20	30.63 ± 7.03
Eyes closeda	41.15 ± 12.20	40.08 ± 13.15	42.43 ± 12.21	42.45 ± 16.78	40.80 ± 12.13	39.85 ± 11.29
Eyes open, soft surfaceb	39.67 ± 8.81	37.14 ± 8.04	38.96 ± 7.96	36.00 ± 7.35	39.56 ± 10.13	36.80 ± 8.06
Eyes closed, soft surfacec	64.56 ± 22.03	61.24 ± 21.42	68.33 ± 26.56	62.76 ± 22.13	67.44 ± 24.84	62.23 ± 22.35
Right legd,e,f	85.72 ± 24.50	85.41 ± 24.21	90.98 ± 26.99	83.14 ± 23.84	89.32 ± 22.88	84.45 ± 23.77
Left legg	88.19 ± 26.38	78.42 ± 22.39	86.15 ± 24.96	83.05 ± 21.19	87.19 ± 21.85	79.38 ± 20.70

Significance tests for pairwise comparison of exposure conditions control for baseline performance in each exposure condition before performing the comparisons.

^aExposure main effect (F = 2.56; df = 2, 141; p = 0.08).

^bTime effect: preexposure > exposure (F = 25.30; df = 1, 212; p < .0001).

^cTime effect: preexposure > exposure (F = 18.83; df = 1, 212; p < 0.0001).

^dExposure × time interaction: (F = 4.58; df = 2, 211; p = 0.01).

^e0.5 ppm < 0.05 ppm (F = 9.03; df = 1, 211; p = 0.01).

^f5 ppm < 0.05 ppm (F = 3.26; df = 1, 211; p = 0.073).

^gExposure × time interaction (F = 2.34; df = 2, 212; p = 0.10).