Anti-H influenzae type b anti-polyribosylribitol phosphate IgG geometric mean concentrations were lower in the consistent limb group than in the alternating limb group at 5 months ( consistent limb 041 g/mL [ 95 % CI 031-054 ] vs alternating limb 061 g/mL [ 045-082 ] ; p = 00268 ) and at 12 months ( 035 g/mL [ 028-043 ] vs 050 g/mL [ 040-062 ] ; p = 00136 ) .