| | |
Gestational age difference (LMP − CRL), days
|
|---|
| |
Number
|
Difference Mean (SD)
|
Difference of the difference (95 % CI)b
|
|---|
|
Years of school
|
|
≤6 years
|
168
|
4.22 (11.1)
|
Reference
|
|
>6 years
|
164
|
1.36 (10.01)
|
−2.86 (−5.15, −0.58)
|
|
Age
|
|
≤20 years
|
123
|
4.25 (9.77)
|
Reference
|
|
>20 years
|
208
|
1.96 (11.13)
|
−2.28 (−4.66, 0.10)
|
|
Early pregnancy BMI
|
|
Underweight (<18.5 kg/m2)
|
132
|
2.47 (10.25)
|
Reference
|
|
Normal (≥18.5 kg/m2)
|
200
|
3.03 (10.97)
|
0.56 (−1.79, 2.92)
|
|
Infant sex
|
|
Male
|
176
|
2.94 (10.77)
|
Reference
|
|
Female
|
156
|
2.66 (10.60)
|
−0.29 (−2.60, 2.02)
|
|
Term statusc
|
|
Term
|
291
|
3.29 (10.72)
|
Reference
|
|
Preterm
|
29
|
-1.57 (10.52)
|
−4.87 (−8.93, −0.80)
|
|
Post-term
|
12
|
1.58 (7.66)
|
−1.71 (−7.86, 4.44)
|
|
SGAd
|
|
Non-SGA
|
170
|
2.38 (11.73)
|
Reference
|
|
SGA
|
119
|
2.96 (9.46)
|
0.58 (−1.97, 3.13)
|
- The Hadlock equation is used for CRL estimate of gestational age
-
LMP first day of the last menstrual period, CRL crown-rump length, SGA small-for-gestational age by Intergrowth 21st Growth Standard [17], BMI body mass index
-
aLive births only
-
bMultivariable linear regression model including all variables in the table
-
cPreterm is <259 days, term is 259–293 days, and post-term is >293 days gestational age by CRL
-
d
n = 288 (with newborn weight measured at birth)
