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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

Variable

Number of children (percentage [95%CI])

Demographics

 Age groups

  < 24 months

139 (16% [13–19%])

  24–35 months

168 (19% [16–22%])

  36–47 months

195 (22% [19–24%])

  48–59 months

208 (23% [20–27%])

  > = 60 months

186 (21% [18–23%])

Number of boys

464 (52% [49–55%])

Factors previously associated with carriage

Cohabitating with siblings < 6 years old

436 (49% [45–53%])

Being breastfed < 2 months

48 (6% [4–8%])

Passive smoking

39 (4% [3–6%])

Vaccine history

881 (99% [98–100%])

 Vaccinated by type

 

  PCV7 only

58 (7% [5–9%])

  PCV7 + PCV13

173 (20% [17–23%])

  PCV13 only

650 (73% [70–77%])

Having had respiratory tract infection during the past 3 months

75 (8% [6–11%])

Having used antimicrobials during the past 3 months

69 (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%])