Table 2

Validity of symphysis-fundal height for identifying different gestational age thresholds

SFH (cm)GA <28 weeksGA <34 weeksGA <37 weeks
SensSpecPPVNPVSensSpecPPVNPVSensSpecPPVNPV
<230.4970.9590.8280.8270.2800.9920.9820.4800.2250.9970.9950.296
<240.6530.9190.7610.8690.3920.9780.9640.5180.3200.9900.9890.322
<250.7840.8640.6960.9100.5000.9480.9350.5590.4140.9670.9750.350
<260.8530.8060.6360.9320.5830.9190.9150.5960.4870.9420.9620.375
<270.9020.7130.5560.9480.6760.8580.8770.6390.5790.8960.9450.410
<280.9350.6350.5050.9610.7450.7990.8470.6770.6510.8530.9310.444
<290.9720.5300.4510.9790.8260.7070.8080.7320.7390.7730.9090.491
<300.9840.4210.4030.9850.8870.5940.7650.7780.8120.6670.8820.537
<310.9890.3330.3710.9870.9290.4950.7330.8230.8660.5690.8600.580
<320.9900.2690.3500.9850.9490.4120.7070.8440.8980.4810.8410.606
  • GA, gestational age; NPV, negative predictive values; PPV, positive predictive values; Sens, sensitivity; SFH, symphysis-fundal height; Spec, specificity.