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Table 5 Case study B: comparison of included primary studies and outcomes in the existing systematic reviews (Galvao et al. [14], Jefferson et al. [15], Fell et al. [13], and McMillan et al. [16])

From: Use of existing systematic reviews for evidence assessments in infectious disease prevention: a comparative case study

Maternal outcomes
Outcome Primary study Galvao et al. [14] Jefferson et al. [15] Fell et al. [13] McMillan et al. [16]
Laboratory-confirmed influenza Thompson et al. [30] No (unclear) No (date) No (criteria) Yes
  Zaman et al. [31] No (unclear) No (unclear) No (criteria) Yes
Influenza-like illness Black et al. [32] No (unclear) Yes No (criteria) Yes
  Hulka [33] Yes Yes No (criteria) No (unclear)
  Munoz et al. [34] No (unclear) No (unclear) No (criteria) Yes
  Zaman et al. [31] Yes No (unclear) No (criteria) No (unclear)
Local adverse events Hulka [33] No (criteria) No (unclear) No (criteria) Yes
  Yeager et al. [35] No (criteria) No (unclear) No (criteria) Yes
  Zaman et al. [31] No (criteria) No (unclear) No (criteria) Yes
Systemic adverse events Englund et al. [36] No (criteria) No (unclear) No (criteria) Yes
  Hulka [33] No (criteria) No (unclear) No (criteria) Yes
  Lin et al. [37] No (criteria) No (unclear) No (criteria) Yes
  Yeager et al. [35] No (criteria) No (unclear) No (criteria) Yes
  Zaman et al. [31] No (criteria) No (unclear) No (criteria) Yes
Serious adverse events Munoz et al. [34] No (criteria) No (unclear) No (criteria) Yes
  Nordin et al. [38] No (criteria) Yes No (criteria) Yes
Preeclampsia Munoz et al. [34] No (criteria) No (unclear) No (criteria) Yes
Infant outcomes
Lab-confirmed influenza Benowitz et al. [39] No (criteria) Yes No (criteria) Yes
  Eick et al. [40] Yes Yes No (criteria) Yes
  Poeling et al. [41] No (criteria) Yes No (criteria) Yes
  Zaman et al. [31] Yes No (unclear) No (criteria) Yes
Influenza-like illness Black et al. [32] No (unclear) Yes No (criteria) Yes
  Eick et al. [40] No (unclear) Yes No (criteria) Yes
  France et al. [42] No (unclear) Yes No (criteria) No (unclear)
  Munoz et al. [34] No (unclear) No (unclear) No (criteria) Yes
  Zaman et al. [31] Yes No (unclear) No (criteria) Yes
Premature birth (<37 weeks) Black et al. [32] Yes Yes Yes Yes
  Chambers et al. [43] No (unclear) No (date) Yes Yes
  Dodds et al. [44] No (unclear) No (unclear) Yes No (unclear)
  Legge et al. [45] No (date) No (date) Yes No (unclear)
  Louik et al. [46] No (date) No (unclear) Yes No (unclear)
  Munoz et al. [34] Yes Yes Yes Yes
  Omer et al. [47] Yes Yes Yes Yes
  Sheffield et al. [48] Yes Yes Yes Yes
  Steinhoff et al. [49] No (unclear) No (unclear) Yes No (unclear)
  Zaman et al. [31] Yes No (unclear) No (unclear) No (unclear)
Fetal death (>500 g) Sheffield et al. [48] Yes Yes Yes Yes
Spontaneous abortion Irving et al. [50] No (criteria) No (date) No (criteria) Yes
Congenital malformation Munoz et al. [34] No (criteria) Yes No (criteria) No (unclear)
  Sheffield et al. [48] No (criteria) Yes No (criteria) Yes
Small for gestational age Omer et al. [47] Yes No (unclear) No (criteria) Yes
  Sheffield et al. [48] Yes No (unclear) No (criteria) Yes
  Zaman et al. [31] Yes No (unclear) No (criteria) No (unclear)
Neonatal death Sheffield et al. [48] Yes Yes No (criteria) No (unclear)
  1. No, no included (with reasons for exclusion in parenthesis: date = published after search date of the SR; criteria = inclusion criteria of the SR not met; unclear = reason for exclusion from the SR unclear); Yes, included