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Table 2 Distribution of perinatal traits by maternal age groups (N = 22,950)

From: The trend in delayed childbearing and its potential consequences on pregnancy outcomes: a single center 9-years retrospective cohort study in Hubei, China

Perinatal traits Groups of maternal age
G1 (n = 11,282)
< 30 years
No. %
G2 (n = 7732)
30–34 years
No. %
G3 (n = 3936)
≥35 years
No. %
P-value
Preterm birth* 2003 (17.8) 1376 (17.8) 1009 (25.6) 0.001
Perinatal mortality* 147 (1.3) 86 (1.1) 89 (2.3) 0.001
LBW* 1575 (14.0) 985 (12.7) 693 (17.6) 0.001
IUGR* 88 (0.8) 56 (0.7) 23 (0.6) 0.4
LPI* 434 (3.8) 293 (3.8) 165 (4.2) 0.5
Low Apgar score* 403 (3.6) 247 (3.2) 181 (4.6) 0.001
Fetal hypoxia* 255 (2.3) 176 (2.3) 88 (2.2) 0.9
Macrosomia* 555 (4.9) 473 (6.1) 212 (5.4) 0.002
Congenital defects*a 157 (1.4) 85 (1.1) 53 (1.3) 0.1
Neonatal gender
 Male 5975 (53) 4133 (53.5) 2170 (55.1) 0.06
 Female 5307 (47) 3599 (46.5) 1766 (44.9)  
  1. * = Frequency and percentage of only ‘Yes’ value presented, LBW Low birth weight, IUGR Intrauterine growth restriction, LPI Low ponderal index, low Apgar score (< 7), fetal hypoxia (a pathophysiological condition in which the fetus is suffering from insufficient oxygen supply), aCongenital defects (microtia, anotia, polydactyly, heart defects, limb reduction defects, cleft lip, cleft palate, hydrocephaly, and NTDs), p-values were calculated using chi-square test