Table 1. Selected characteristics of pregnant women and newborns and distributions of relative telomere length (RTL) between maternal blood and cord blood.

Variables	No. (%)	RTL of maternal blood	RTL of cord blood	Pa
Age at current pregnancy (Years)
<25	53(11.94)	0.320 ± 0.091	0.358 ± 0.095	0.052
25~35	359(80.86)	0.305 ± 0.080	0.354 ± 0.106	0.000
≥35	32(7.21)	0.327 ± 0.105	0.343 ± 0.087	0.534
Pb		0.042	0.260
Season of delivery
March–May	153(34.46)	0.309 ± 0.077	0.358 ± 0.102	0.000
June–August	165(37.16)	0.315 ± 0.087	0.353 ± 0.118	0.001
September–November	93(20.95)	0.296 ± 0.080	0.350 ± 0.081	0.000
December–February	33(7.43)	0.314 ± 0.097	0.350 ± 0.086	0.124
Pb		0.350	0.947
Gestational age (weeks)
<37	45(10.14)	0.310 ± 0.074	0.369 ± 0.119	0.010
≥37	399(89.86)	0.308 ± 0.084	0.352 ± 0.101	0.000
Pb		0.897	0.294
Birth weight (g)
<2,500	35(7.88)	0.318 ± 0.090	0.372 ± 0.135	0.069
≥2500	409(92.12)	0.308 ± 0.083	0.352 ± 0.100	0.000
Pb		0.492	0.281
Mode of delivery
Vaginal	363(81.76)	0.309 ± 0.085	0.353 ± 0.102	0.000
Cesarean section	81(18.24)	0.308 ± 0.078	0.358 ± 0.112	0.002
Pb		0.905	0.685
Sex of newborns
Boy	226(50.90)	0.306 ± 0.083	0.347 ± 0.103	0.000
Girl	218(49.10)	0.311 ± 0.083	0.361 ± 0.104	0.000
Pb		0.579	0.133

^aP value for paired t-test that was used to compare the differences between mother-newborn pairs for RTL. ^bP value for one-way anova or t-test that was employed to examine the differences of RTL between subgroups divided by selected characteristics.