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TABLE 2

Characteristics of the Study Population at KPNC, January 2006–June 2017

Study Population (N = 469 982), n (%)
Age at study entrya  
 3 mo 343 712 (73) 
 >3 mo to <1 y 21 036 (4) 
 1 to <2 y 24 323 (5) 
 2 to <3 y 21 597 (5) 
 3 to <4 y 17 461 (4) 
 4 to <5 y 15 543 (3) 
 5 to <6 y 14 140 (3) 
 6 to <7 y 12 146 (3) 
 7 y 24 (0.0) 
Born at KPNC hospital 419 823 (89) 
Year of birth  
 1999–2001 41 816 (9) 
 2002–2004 63 366 (14) 
 2005–2007 91 594 (19) 
 2008–2010 91 512 (19) 
 2011–2013 88 911 (19) 
 2014–2016 92 783 (20) 
Sex  
 Female 229 154 (49) 
 Male 240 828 (51) 
Race or ethnicityb  
 White 182 938 (39) 
 Asian or Pacific Islander 112 142 (24) 
 Hispanic (regardless of race) 111 165 (24) 
 Black 28 673 (6) 
 American Indian or Alaskan native 2260 (0) 
 Missing 32 804 (7) 
Pertussis status  
 PCR-positive for pertussis 738 (0.2) 
Study Population (N = 469 982), n (%)
Age at study entrya  
 3 mo 343 712 (73) 
 >3 mo to <1 y 21 036 (4) 
 1 to <2 y 24 323 (5) 
 2 to <3 y 21 597 (5) 
 3 to <4 y 17 461 (4) 
 4 to <5 y 15 543 (3) 
 5 to <6 y 14 140 (3) 
 6 to <7 y 12 146 (3) 
 7 y 24 (0.0) 
Born at KPNC hospital 419 823 (89) 
Year of birth  
 1999–2001 41 816 (9) 
 2002–2004 63 366 (14) 
 2005–2007 91 594 (19) 
 2008–2010 91 512 (19) 
 2011–2013 88 911 (19) 
 2014–2016 92 783 (20) 
Sex  
 Female 229 154 (49) 
 Male 240 828 (51) 
Race or ethnicityb  
 White 182 938 (39) 
 Asian or Pacific Islander 112 142 (24) 
 Hispanic (regardless of race) 111 165 (24) 
 Black 28 673 (6) 
 American Indian or Alaskan native 2260 (0) 
 Missing 32 804 (7) 
Pertussis status  
 PCR-positive for pertussis 738 (0.2) 
a

Children born in 1999 entered the study on January 1, 2006, at 6 years of age, except for the few children born on January 1, 1999, who entered the study at 7 years of age; children born in 2000 entered the study on January 1, 2006, at 5 years of age, except for the few born on January 1, 2000, who entered the study at 6 years of age; and so on. Children born in or after October 2005 entered the study on their 3-month birthday.

b

The categories are mutually exclusive.

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