. Author manuscript; available in PMC: 2011 Sep 1.

Published in final edited form as: Int J Gynaecol Obstet. 2010 Sep;110(3):231–234. doi: 10.1016/j.ijgo.2010.03.030

Table 5.

Classification of preterm, term, and post-term/postdate deliveries by the 3 methods^a

Method	Gestational age at delivery			Test statistic	P value
Method	<37 wk (preterm)	37–40 wk (term)	≥41 wk (post-term/postdate)	Test statistic	P value
LMP	173 (15.3)	786 (69.7)	169 (14.9)	2.28	0.32
SFH	174 (15.4)	807 (71.5)	147 (13.0)	4.71	0.09
US	199 (17.6)	873 (77.4)	56 (4.9)	58.24,	<0.001

Abbreviations: LMP, last menstrual period; SFH, symphysis–fundal height; US, ultrasound.

Values are given as number (percentage); comparisons were made by the χ² homogeneity test.