Table 2.

Predictive value of maternal self-reported varicella disease history on varicella immune status in pregnant women

^aThe proportion of seropositive subjects among those who self-reported having had varicella

^bThe proportion of seronegative subjects among those who self-reported a negative or uncertain history of varicella

^cOnly specimens initially testing negative or equivocal by wc-ELISA were retested using gp-ELISA.

PPV = positive predictive value

NPV = negative predictive value

CI = confidence interval

Hx = history of disease

wc-ELISA = whole-cell enzyme-linked immunosorbent assay

gp-ELISA = glycoprotein enzyme-linked immunosorbent assay