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

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%

Outcome^g

 POG at delivery (N_p = 1510)

39.00 (37.71–39.86)

 Birthweight (N_p = 1211)

2832 (2500–3200)

 Birthweight centile (N_p = 1211)

19 (6–43)

 Birthweight Z score (N_p = 1211)

−0.88 (−1.52 – −0.18)

 PTB (N_p = 1510)

251 (16.62%)

 SGA (N_p = 1211)

408 (33.69%)