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Table 1 Baseline characteristics of the participants included in the TRAINING DATASET (Np = 1721) to compare different methods of dating

From: Comparison of first trimester dating methods for gestational age estimation and their implication on preterm birth classification in a North Indian cohort

Sociodemographic characteristics Median (IQR) or N (%)or Mean ± SD
Age (year) 23 (21–26)
GA at enrolment by LMP (weeks) 11.31 ± 2.67
GA at enrolment by USG-Hadlock (weeks) 10.87 ± 2.28
BMI at enrolment into the cohort a
 Underweight 27.20%
 Normal weight 59.93%
 Obese 9.09%
 Overweight 1.66%
Haemoglobin (g/dL) 8.8 (8.2–9.2)
Height (cm) 153.0 (149.2–156.8)
Socioeconomic status b
 Upper class 0.66%
 Upper middle class 15.40%
 Lower middle class 33.98%
 Upper lower class 48.96%
 Lower class 0.43%
 Undetermined 0.57%
Parity (number)
 0 49.53%
 1 33.55%
 2 12.60%
 3 3.34%
 4 0.74%
 5 0.14%
Level of education
 Illiterate 21.58%
 Literate or primary school 8.63%
 Middle school 15.09%
 High school 18.61%
 Post high school diploma 20.89%
 Graduate 12.23%
 Post-graduate 2.94%
Occupation
 Unemployed 93.48%
 Unskilled worker 3.34%
 Semi-skilled worker 0.97%
 Skilled worker 1.40%
 Clerk, shop, farm owner 0.17%
 Semi-professional 0.26%
 Professional 0.34%
Religion
 Hindu 92.14%
 Muslim 6.60%
 Sikh 0.40%
 Christian 0.74%
 Buddhist 0.00%
 More than one religion 0.09%
Fuel used for cooking c
 Biomass fuel 7.86%
 Clean fuel d 92.14%
Source of drinking water
 Safe water e 49.80%
 Unsafe water 50.20%
Second-hand tobacco smoke
 Exposed 19.23%
 Unexposed 80.57%
 Undetermined 0.20%
History of any chronic illnesses f
 Absent 99.03%
 Present 0.97%
History of hypertensive disease of pregnancy
 Absent 99.57%
 Present 0.43%
History of contraceptive at the time of conception
 Absent 90.79%
 Present 7.30%
Outcomeg
 POG at delivery (Np = 1510) 39.00 (37.71–39.86)
 Birthweight (Np = 1211) 2832 (2500–3200)
 Birthweight centile (Np = 1211) 19 (6–43)
 Birthweight Z score (Np = 1211) −0.88 (−1.52 – −0.18)
 PTB (Np = 1510) 251 (16.62%)
 SGA (Np = 1211) 408 (33.69%)
  1. a Pre-pregnancy BMI was calculated as weight (kg)/height2 (m) from participants’ weight and height measured at enrolment. BMI categories were defined as underweight (< 18.5); normal (18.5–24.9); overweight (25.0–29.9); obese (≥ 30.0)
  2. b Socioeconomic status was assessed using Modified Kuppuswamy’s socioeconomic scale [25], calculated using education and occupation of the head of the family and monthly family income
  3. c Indoor air pollution: use of biomass fuel for cooking or presence of a smoker in the residential compound, as reported by the participant
  4. d Clean fuel includes liquefied petroleum gas and electricity
  5. e Safe water includes bottled water or piped water into the residence
  6. f Chronic illnesses include a history of hypertension, diabetes, cardiac disease and thyroid disorders
  7. g Denominators for these outcome rates are variable depending on availability of data