TABLE 4.

Neuropsychological maturity test average centile scores for visual perception.

	Visual perception
	Pre-intervention, median [IQR]	Post-intervention, median [IQR]	Effect size (within group)	P value
Control	45.00 [40.00–75.00]	45.00 [26.25–48.75]	−0.31	0.184
OMT	57.50 [40.00–78.75]	47.50 [35.00–70.00]	−0.42	0.019

IQR, interquartile range; OMT, osteopathic manipulative treatment.