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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)