Studies of pneumococcal conjugate vaccination and carriage in Africa (n = 9,549).

w-weeks, m-months, y-years, RD- Risk difference- Risk in the PCV vaccinated group minus the risk in the control group calculated in Stata, PPV-Polyvalent polysaccharide vaccine, ns- not stated,
a children who received PCV 5 in an RCT and controls matched with age and place of residence who did not receive PCV, PCVb+c received b+c doses of PCV doses with
b for the primary series and
c for booster dose,
d includes vaccine associated serotypes.
e received PCV7 at 6, 10 and 14 weeks,
f received PCV7 at 6, 10 and 14 weeks or at 0, 10 and 14 weeks,
g Overall carriage for both groups,
h 4–6 months after vaccination,
i 22 months after vaccination;
these three studies were not included in the meta-analysis (in these 3 studies, both groups received PCV).P-value obtained using Fisher's exact test.