Table. 1.

Comparison of gestational age in the study groups.

Study group	Abbreviation*	No. of patients	Gestational age (wk)#
(a) Term with established labor	TL	11	38.9 ± 0.8 (38.0; 40.0)
(b) Term without labor (San Antonio)	TNL-s	10	39.2 ± 0.4 (38.7; 40.1)
(c) Term without labor (London)	TNL-l	9	39.6 ± 0.8 (38.6; 41.0)
(d) Preterm without labor	PTNL	10	33.7 ± 1.6 (30.7; 36.0)†
(e) Idiopathic preterm labor	iPTL	6	34.9 ± 1.3 (32.9; 36.1)†
(f) Preterm twin gestations with labor	tPTL	7	34.1 ± 1.8 (31.6; 36.7)†

^* TL, term with labor; TNL, term no labor; PTNL, preterm no labor; PTL, preterm with labor.

^# Data are given as mean ± SD with the range in the parentheses.

^† P < 0.0001 versus (a) TL, (b) TNL-s, and (c) TNL-l groups with one-way ANOVA followed by Bonferroni post hoc comparisons tests.