Table 3 Maternal anti–HPA-1a... | American Society of Hematology

Table 3

Maternal anti–HPA-1a alloantibody concentrations before 28 weeks of gestation and fetal platelet counts: statistical analysis

Maternal antibody concentration, IU/mL	Platelet count, × 10⁹/L		P	Sensitivity, %	Specificity, %	PPV, %	NPV, %
Maternal antibody concentration, IU/mL	< 50	≥ 50	P	Sensitivity, %	Specificity, %	PPV, %	NPV, %
			.0016*	81.2	83.3	86.7	76.9
< 28, n	3	10
≥ 28, n	13	2

Maternal antibody concentration, IU/mL	Platelet count, × 10⁹/L		P	Sensitivity, %	Specificity, %	PPV, %	NPV, %
Maternal antibody concentration, IU/mL	< 50	≥ 50	P	Sensitivity, %	Specificity, %	PPV, %	NPV, %
			.0016*	81.2	83.3	86.7	76.9
< 28, n	3	10
≥ 28, n	13	2

PPV indicates positive predictive value; and NPV, negative predictive value.

P < .05.