Table 2: Patient characteristics

		Outcome			Outcome
Characteristics	All Patients	Normal cognitive function	Learning disabled or mentally handicapped	p-value1	With epilepsy	Without epilepsy	p-value1
	(n=41)	(n=16)	(n=25)		(n=20)	(n=21)
	n (%)	n (%)	n (%)		n (%)	n (%)
Male	26 (63)	9 (56)	17 (68)	0.52	14 (67)	12 (57)	0.52
Side of injury
Left	22 (54)	8 (50)	14 (56)	0.76	9 (45)	13 (62)	0.35
Right	19 (46)	8 (50)	11 (44)		11 (55)	8 (38)
Pregnancy
Normal2	28 (68)	13 (81)	15 (60)	0.19	12 (60)	16 (76)	0.33
Abnormal	13 (32)	3 (19)	10 (40)		8 (40)	5 (24)
Length of gestation
Term (36 weeks)	29 (71)	12 (75)	17 (68)	0.73	15 (75)	14 (67)	0.73
Premature	12 (29)	4 (25)	8 (32)		5 (25)	7 (33)
Delivery
Normal	34 (83)	13 (81)	21 (84)	1	17 (85)	17 (81)	1
Abnormal	7 (17)	3 (19)	4 (16)		3 (15)	4 (19)
Post natal period
Normal	20 (49)	7 (44)	13 (52)	0.75	10 (50)	10 (48)	1
Abnormal	21 (51)	9 (56)	12 (48)		10 (50)	11 (52)
Clinical pattern
Arm dominant	20 (49)	3 (19)	17 (68)	0.003	15 (75)	5 (24)	0.002
Leg dominant	14 (34)	10 (62)	4 (16)		2 (10)	12 (57)
Proportional	7 (17)	3 (19)	4 (16)		3 (15)	4 (19)
Upper limb function
Grade 0-1	20 (49)	5 (31)	15 (60)	0.11	14 (70)	6 (29)	0.01
Grade 2-3	21 (51)	11 (69)	10 (40)		6 (30)	15 (71)
Imaging Findings
Positive cortical grey	23 (56)	5 (31)	18 (72)	0.02	19 (95)	4 (19)	<0.01
Negative cortical grey	18 (44)	11 (69)	7 (28)		1 (5)	17 (81)

Notes: ¹ Fisher's exact test for descriptive purposes only. ² Including twins or triplets.

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Table 3: Potential risk factors for cognitive function and epilepsy

Factor / Outcome	Reference Level	Learning disabled or mentally handicapped Odds Ratio1 (95% CI) [p-value]2	Epilepsy Odds Ratio1 (95% CI) [p-value]2
Pregnancy
Abnormal	Normal	2.9 (0.7, 12.8) [p=0.08]	2.1 (0.6, 8.2) [p=0.14]
Clinical Pattern
Arm dominant	Leg dominant	14.2 (2.6, 75.8) [p=0.001]	18.0 (3.0, 107.7) [p<0.01]
Arm dominant	Proportional	4.3 (0.6, 29.2) [p=0.07]	4.0 (0.7, 24.4) [p=0.07]
Upper limb function
Grade 0-1	Grade 2-3	3.3 (0.9, 12.4) [p=0.08]	5.0 (1.4, 20.0) [p< 0.01]
Imaging findings
Positive cortical grey	Negative cortical grey	5.7 (1.4, 22.3) [p=0.007]	80.7 (8.5, 767.3) [p< 0.01]

Notes: "CI" stands for confidence interval. ¹ Odds ratio was estimated from a logistic regression relating outcome (i.e. abnormal cognitive function or epilepsy) with each of the risk factors. ² chi-square test of no effect due to each risk factor.

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