Table 2.

Contingency table representing the proportion of participants with a “Sectioned” and “Not Sectioned” left and right HIPS in the different groups (Grade 1, Grade 2 to 4 and Adult).

			Right HIPS
			Sectioned	Not Sectioned	Total
Left HIPS	Grade 1	Sectioned	13	6	19
		Not Sectioned	5	2	7
		Total	18	8	26
	Grade 2−4	Sectioned	14	11	25
		Not Sectioned	18	8	26
		Total	32	19	51
	Adult	Sectioned	6	4	10
		Not Sectioned	7	4	11
		Total	13	8	21
	Total	Sectioned	33	22	55
		Not Sectioned	30	13	43
		Total	63	35	98