Shahid 1995.

Methods	The study was a prospective double‐blind controlled trial.
Participants	Country: Bangladesh. Number: 36 women in the intervention group and 34 women in the control group. Mean age: 25.6 years. Mean gestational age: 32.3 weeks.
Interventions	23‐valent pneumococcal polysaccharide vaccine vs meningococcal vaccine.
Outcomes	Maternal antibody levels (GM). Incidence of tenderness at the injection site.
Notes
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Details were not reported.
Allocation concealment (selection bias)	Unclear risk	Details were not reported.
Blinding of participants and personnel (performance bias) All outcomes	Low risk	Quote: “double blind”.
Blinding of outcome assessment (detection bias) All outcomes	Low risk	Quote: “double blind”.
Incomplete outcome data (attrition bias) All outcomes	High risk	7/36 missing from intervention group; 10/34 missing from control group.
Selective reporting (reporting bias)	Low risk	All outcomes were predefined and reported.
Other bias	Low risk	The trial appears to be free of industry sponsorship.