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. Author manuscript; available in PMC: 2015 Jul 14.
Published in final edited form as: Seeing Perceiving. 2012;25(2):143–154. doi: 10.1163/187847612X626381

Table 2. Group response function thresholds in no IVH and Grade I/II IVH groups.

Thresholds differed for the vernier offset (VA), grating acuity/spatial frequency (GA) and contrast (CS) sweeps. IVH, intraventricular hemorrhage. The number of infants (n) in the calculation of each mean is shown below each entry in the table.

Group Response GA(c/deg) CS (%) VA(arcmin)
IVH Threshold
± SEM		 8.235
±0.673
(n = 9)		 1.436
±0.097
(n = 13)		 1.554
±0.169
(n = 10)
No IVH Threshold
±SEM		 13.066
±.454
(n = 43)		 1.178
±0.041
(n = 52)		 0.579
±0.045
(n = 39)
Difference t-score
p-value		 12.635
<0.001 		8.749
<0.001 		22.539
<0.001