Table 4.

Comparison of Cohorts 1 and 2: Co-occurring Conditions

Top Six Co-occurring Conditions (ICD-9 Codes)
Cohort 1	Cohort 2
Attention deficit disorder with hyperactivity (314.01)	Constipation, unspecified (564.00)
Other Convulsions (780.39)	Abdominal pain, unspecified site (789.00)
Constipation, unspecified (564.00)	Other Convulsions (780.39)
Anxiety state, unspecified (300.00)	Allergic rhinitis, cause unspecified (477.9)
Abdominal pain, unspecified site (789.00)	Attention deficit disorder with hyperactivity (314.01)
Unspecified episodic mood disorder (296.90)	Anxiety state, unspecified (300.00)

Percentage of Co-occurring Conditions
Condition	Cohort 1	Cohort 2	chi-square	p-value
Attention deficit disorder with hyperactivity	47%	21%	10.59	0.001
Other Convulsions	45%	23%	7.68	0.006
Constipation, unspecified	39%	35%	0.11	0.74
Anxiety state, unspecified	35%	21%	3.05	0.08
Abdominal pain, unspecified site	33%	29%	0.13	0.71
Unspecified episodic mood disorder	32%	15%	5.40	0.02
Allergic rhinitis, cause unspecified	15%	20%	0.62	0.43