Table 2.

Surgeries performed among cases and controls

Procedure type	Cases (N = 499)	Controls (N = 998)
Ear, nose and throat	74 (15%)	85 (9%)
General	25 (5%)	32 (3%)
Urologic	18 (4%)	25 (3%)
Ophthalmology	8 (2%)	8 (1%)
Orthopedic	3 (1%)	7 (1%)
Neurologic	3 (1%)	4 (0%)
Oral/Maxillofacial	6 (1%)	6 (1%)
Cardiovascular	6 (1%)	1 (0%)
Other	10 (2%)	8 (1%)

Values represent the number (%) of children among cases or controls who had at least 1 of the designated types of surgery. Among cases, 132 children underwent 194 procedures requiring general anesthesia and among controls, 155 children underwent 230 procedures