Table 2. SSC problematic GI symptoms results.

The previous and current percent of ASD children and NT siblings having a problematic GI symptom is listed below. The previous percent were based on parental responses to the SSC medical form for ASD children only on first entering the SSC registry. The current percent were based on parental responses to the same forms for both ASD and NT siblings during the current study ~2–3 years later. The P-values reflect comparison of the current responses of the ASD and NT siblings. There was no significant change in the prevalence of any of the seven problematic GI symptoms in the ASD children at the two time points.

Problematic GI Symptoms	ASD n = 59		NT n = 44	P-value ASD vs. NT
	Previous	Current	Current	Current
Excessive Gas	7%	5%	2%	0.32
Vomiting	7%	3%	0%	0.33
Bloating	3%	2%	2%	0.49
Severe Abdominal Pain	0%	0%	7%	0.07
Constipation	31%	32%	18%	0.05
Diarrhea	14%	11%	5%	0.24
Smelly Stools	7%	7%	0%	0.33