Table 2. Maternal Clinical and Newborn Characteristics of Participants.

Variables		Intervention group (TENS-ON )	Placebo group (TENS-OFF)	Control group (Routine care)	P-value	Test
Type of Pregnancy	Wanted	29 (72.50)	35 (87.50)	32 (80.00)	0.26	Independent T-test
	Unwanted	11 (27.50)	5 (12.50)	8 (20.00)
Gestational Age (week)	Mean ± SD	39.3 ± 1.12	39.2 ± 1.13	39.5 ± 1.13	0.85	ANOVA
Number of pregnancies	1	35 (87.50)	32 (80.00)	34 (85.00)	0.92	Independent T-test
	2	3 (7.50)	5 (12.50)	3 (7.50)
	3	2 (5.00)	3 (7.50)	3 (7.50)
Number of abortions	0	35 (87.50)	32 (80.00)	34 (85.00)	0.92	Independent T-test
	1	3 (7.50)	5 (12.50)	3 (7.50)
	2	2 (5.00)	3 (7.50)	3 (7.50)
Participation in the physiological delivery classes	Yes	20 (50.00)	22 (55.00)	30 (75.00)	0.054	Pearson correlation
	No	20 (50.00)	18 (45.00)	10 (25.00)
Perineal massage during pregnancy	Yes	10 (25.00)	10 (25.00)	10 (25.00)	>0.99	Pearson correlation
	No	30 (75.00)	30 (75.00)	30 (75.00)
Duration of the first stage of Labor (hour)	Mean ± SD	9.825 ± 3.43	10.375 ± 3.70	9.5 ± 2.276	0.55	Kruskal-Wallis
Duration of the second stage of Labor (min)	Mean ± SD	47.50 ± 25.54	49.50± 29.26	35.375 ± 14.69	0.057	Kruskal-Wallis
Duration of the third stage of Labor (min)	Mean ± SD	8.65 ± 5.18	8.875 ± 3.90	8.40 ± 7.71	0.31	Kruskal-Wallis
Incidence of shoulder dystocia during delivery	Yes	0 (0.00)	2 (5.00)	0 (0.00)	0.13	Pearson correlation
	No	40 (100.00)	38 (95.00)	40 (100.00)
Newborn’s sex	Female	21 (52.50)	18 (45.00)	22 (55.00)	0.64	Pearson correlation
	Male	19 (47.50)	22 (55.00)	18 (45.00)
Newborn’s weight (gr)	Mean ± SD	3247.75 ± 305.500	3306 ± 299.622	3308.75 ± 228.96	0.54	ANOVA
Circumference of the baby’s head (cm)	Mean ± SD	34.52 ± 1.52	34.7 ± 1.31	34.7 ± 1.32	0.78	ANOVA

ANOVA: Analysis of variance