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Table 1 Demographic characteristics of the included Preterm SAMBA population

From: Performances of birthweight charts to predict adverse perinatal outcomes related to SGA in a cohort of nulliparas

Characteristics Study population
N (%)
Region
  Northeast 476 (47.7)
  South and Southeast 521 (52.3)
Maternal age (years)
  ≤ 19 252 (25.3)
  20–34 680 (68.2)
  ≥ 35 65 (6.5)
Ethnicity
  White 405 (40.6)
  Non-white 592 (59.4)
Marital status
  With partner 733 (73.5)
  Without partner 264 (26.5)
Maternal Occupation
  Paid work 493 (49.4)
  Homemaker 182 (18.3)
  Not working 322 (32.3)
Schooling (years)
  < 12 673 (67.5)
  ≥ 12 324 (32.5)
Annual Family Income (US$)
  Up to 3,000 45 (4.5)
  3,000 to 12,000 537 (53.9)
  Above 12,000 415 (41.6)
Source of prenatal care
  Entirely public 858 (86.1)
  Private/insurance/mixed 139 (13.9)
Body Mass Index at enrolment (kg/m2) a
  Underweight (< 21.5) 173 (17.4)
  Normal weight (21.5–26.2) 389 (39.0)
  Overweight (26.3–30.9) 262 (26.3)
  Obesity (> 30.9) 172 (17.3)
Smoking
  No smoking 923 (92.6)
  Smoking (at any time of pregnancy 74 (7.4)
Alcohol drinking b
  No alcohol 722 (72.4)
  Drinker 147 (14.7)
  Using Other Drugs c 44 (4.4)
  Maternal pre-existing conditions e 124 (12.4)
Total 997
  1. Missing information for a) 1, b) 128, c) 144, d) 137
  2. e) Maternal conditions included anemia, depression, hypertension without use of medication
  3. BMI cut-off values at 19–21 weeks of gestational age according to Atalah et al. [32]