TABLE 2.

Linear regression analysis of factors likely to influence anti-PRP antibody concentrations and avidity indexes at 3 to 5 years of age^a

Factor	Log anti-PRP antibody	Log anti-PRP avidity index
Log anti-PRP avidity index	0.052	NA
Log anti-PRP antibody	NA	0.052
Yr of serum collection	0.03*	0.06
Linear trend	0.003*	0.66
Age	0.97	0.004*
Concomitant MenC	0.04*	0.09

^aValues are P values, and asterisks indicate those that are significant (P values of <0.05). NA, not applicable.