Table 6.

Hospitalization Rates in the Control Sample

	0-9 years of age		10-19 years of age
	Including controls with malformations	Excluding controls with malformations	Including controls with malformations	Excluding controls with malformations
Number of observations	618,082	586,874	343,797	326,991
Hospitalized at least once	54,562 (8.83%)	48,280 (8.23%)	16,967 (4.94%)	15,791 (4.83%)
Hospitalization days among those hospitalized	5.23 (11.37)	4.68 (9.73)	3.88 (9.27)	3.83 (9.39)

Note: The Table reports crude (unadjusted) hospitalization rates and average length of stay in the control sample born between 1977 and 2002 when including and excluding individuals with birth defects. The frequency of those hospitalized is reported with the percentage in parenthesis. The mean of hospitalization days is reported with the standard deviation in parenthesis.