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Table 1 Characteristics of the study participants in 2015, 4 years after switching to PCV13

From: Changes in pneumococcal carriage prevalence and factors associated with carriage in Norwegian children, four years after introduction of PCV13

VariableNumber of children (percentage [95%CI])
Demographics
 Age groups
  < 24 months139 (16% [13–19%])
  24–35 months168 (19% [16–22%])
  36–47 months195 (22% [19–24%])
  48–59 months208 (23% [20–27%])
  > = 60 months186 (21% [18–23%])
Number of boys464 (52% [49–55%])
Factors previously associated with carriage
Cohabitating with siblings < 6 years old436 (49% [45–53%])
Being breastfed < 2 months48 (6% [4–8%])
Passive smoking39 (4% [3–6%])
Vaccine history881 (99% [98–100%])
 Vaccinated by type 
  PCV7 only58 (7% [5–9%])
  PCV7 + PCV13173 (20% [17–23%])
  PCV13 only650 (73% [70–77%])
Having had respiratory tract infection during the past 3 months75 (8% [6–11%])
Having used antimicrobials during the past 3 months69 (8% [6–9%])
Number of children per day-care centre (DCC), by category
 10–29 children (9 DCCs)122 (14% [67–26%])
 30–49 children (11 DCCs)253 (28% [15–46%])
 50–69 children (11 DCCs)277 (31% [17–49%])
 70–89 children (8 DCCs)214 (24% [11–43%])
 90+ children (1 DCC)30 (3% [0.4–22%])