Table 1. Age Distribution in Cases and Controls ^a.

Groups	Age, y	P value
Cases (n = 100)	43.4±6.5a	0.002
Controls (n = 100)	40.7±6.0
Cases with neurologic problems (n = 40)	44.6±6.3	0.153
Cases without neurologic problems (n = 60)	42.7±6.6

^a Data are presented as Mean±SD.