Table 6.

A univariate analysis of the prognoses of the premature infants

group	Number of cases	Gestational age	Birth weight	Singleton	Cesarean section
Survival group	89	30.5 + 4.2	1271 (800, 1490)	81 (91.01)	70 (78.65)
Death group	9	29.2 + 2.1	1158 (960, 1400)	7 (77.78)	6 (66.67)
t	-	2.36	-2.78	1.56	0.67
P	-	0.005	0.01	0.19	0.43
group	Number of cases	Elderly puerpera (age ≥ 35 years)	Placental abruption	Placenta previa	Pregnancy-induced hypertension
Survival group	89	15 (16.85)	8 (8.99)	3 (3.37)	36 (40.45)
Death group	9	4 (44.44)	2 (22.22)	0	3 (33.33)
t	-	3.98	1.56	-	0.17
P	-	0.04	0.19	0.53	0.7
group	Number of cases	Gestational diabetes	Infection in the second and third trimester of pregnancy		Premature rupture of membranes
Survival group	89	20 (22.47)	4 (4.49)		44 (49.43)
Death group	9	3 (33.33)	0		8 (88.89)
t	-	0.54	-		5.11
P	-	0.48	0.46		0.02

Note: A significant difference is P < 0.05.