Table 4.

Sensitivity, Specificity, PPV and NPV for different methods to distinguish between term and preterm deliveries (< 37 gestational weeks)

Indicator	LMP	SFH	BS	p
Sensitivity (95%CI)	0.63 (0.50–0.75)	0.80 (0.74–0.85)	0.42 (0.35–0.49)	0.093
Specificity (95%CI)	0.72 (0.66–0.76)	0.74 (0.72–0.76)	0.77 (0.74–0.79)	< 0.001
PPV (95%CI)	0.28 (0.21–0.36)	0.35 (0.31–0.39)	0.23 (0.19–0.27)	< 0.001
NPV (95%CI)	0.92 (0.88–0.95)	0.96 (0.94–0.97)	0.89 (0.87–0.91)	< 0.001
Area under the curve	0.67 (0.61–0.74)	0.77 (0.74–0.80)	0.59 (0.56–0.63)	0.0051