Table 2.

Statistical approaches used in different studies to investigate modifications of humoral immune response to infant vaccination after Tdap vaccination during pregnancy.

Author	Geometric mean concentrations (or titres)	Geometric mean ratio	Seroprotection rate
Hardy-Fairbanks et al [14]	✓		✓
Ladhani et al [8]	✓		✓
Hoang et al [15]	✓
Maertens et al [16]	✓
Maertens et al [17]	✓
Maertens et al [18]	✓
Munoz et al [3]	✓		✓
Maertens et al [5]	✓		✓
Halperin et al [4]	✓		✓
Barug et al [10]	✓	✓
Zimmermann et al [7]	✓	✓	✓
Rice et al [6]	✓		✓
Barug et al [19]	✓	✓	✓
Klein et al [20]	✓		✓
Perret et al [21]	✓		✓
Wanlapakorn et al [22]	✓
Wanlapakorn et al [23]	✓		✓