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Table 3 Differences in LMP and CRL estimates of gestational age at birth by maternal and infant characteristics, rural Bangladesh, 2008–2009a

From: A home calendar and recall method of last menstrual period for estimating gestational age in rural Bangladesh: a validation study

  

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)

  1. The Hadlock equation is used for CRL estimate of gestational age
  2. 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
  3. aLive births only
  4. bMultivariable linear regression model including all variables in the table
  5. cPreterm is <259 days, term is 259–293 days, and post-term is >293 days gestational age by CRL
  6. d n = 288 (with newborn weight measured at birth)