TABLE 1

Characteristics of Eligible and Enrolled Cases-Patients, and Controls, ABCs and MeningNet Sites, 2006 to 2013

Eligible Cases, n = 320Enrolled Cases, n = 181Controls, n = 199
Mean age, y18.9 (11 to 27)19.2 (11 to 27)18.9 (12 to 25)
Men, n (%)184 (58)107 (59)102 (51)
Race, n (%)
 White213 (67)121 (67)170 (85)
 African American64 (20)36 (20)10 (5)
 Other14 (4)8 (4)15 (8)
Reported smoker, n (%)62 (34)49 (25)
Reported underlying condition, n (%)a22 (12)4/199 (2)
Serogroup, n (%)
 C156 (49)88 (49)
 Y139 (43)80 (44)
 W25 (8)13 (7)
Outcome, n (%)
 Survived270 (85)156 (87)
 Died46 (15)23 (13)
Year, n (%)
 200641 (13)22 (12)25 (13)
 200739 (12)24 (13)33 (17)
 200825 (8)11 (6)14 (7)
 200948 (15)27 (15)34 (17)
 201060 (19)41 (23)51 (26)
 201145 (14)24 (13)15 (8)
 201236 (11)21 (12)20 (10)
 201322 (7)11 (6)7 (4)
  • —, not applicable.

  • a Underlying conditions for controls included cancer (n = 1), diabetes (n = 1), and other immunodeficiency disorder, not specified (n = 2). Underlying conditions for cases included cancer (n = 2), complement deficiency (n = 5), diabetes (n = 3), kidney disease (n = 2), asplenia (n = 1), and other immunodeficiency disorder, not specified (n = 9).