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Table 1 Presentation of all variables registered at first and second data entry in the Sweedish Maternal Health Care Register (MHCR)

From: Internal validity of the Swedish Maternal Health Care Register

First data entry Second data entry
Data collected at first visit in antenatal care (ANC) Data collected at postpartum visit in antenatal care (ANC) 4 to 16 weeks after delivery
Variables Variables Variables
Date of first visit in ANC a Live born child Treatment of psychiatric disorder
Country of birth Still birth/termination of pregnancy Questioned about exposure to violence
No. of previous deliveries Date of delivery estimated by ultrasound Oral glucose tolerance test (OGTT) performed
Maternal weight (kilograms) b Estimated date of delivery (ultrasound) 2-hour value of plasma glucose at OGTT (mmol/L)
Maternal height (centimetres) b Estimated date of delivery (last menstruation) Diagnosis of gestational diabetes mellitus (GDM)
Smoking three months prior to pregnancy Ultrasound examination at gestational age 16-21 week Date of delivery
No. of cigarettes/day three months prior to pregnancy Combined Ultrasound and Biochemical screening (CUB) Maternal age at delivery
Smoking at first ANC visit Second trimester serum screening Mode of delivery
No. of cigarettes/day at first ANC visit Chorionic villus sampling (CVS) If caesarean section, elective or emergency section
Use of snuff three months prior to pregnancy Amniocentesis (AC) Singleton birth/multiple births
Use of snuff at first ANC visit Number of antenatal visits until estimated date of delivery (determined by ultrasound) Birth weight (grams) c, d
Assessment of use of alcohol prior to pregnancy with screening instrument Alcohol Use Disorder Identification Test (AUDIT) Number of midwives surveying the pregnant woman in ANC Gender of infant d
AUDIT-score Use of authorized interpreter Documented suspicion of intrauterine growth retardation
Education level Smoking at 32 weeks of gestation Postpartum visit at ANC
Employment status No. of cigarettes/day at 32 gestational weeks Date of postpartum visit at ANC
Self-rated health prior to pregnancy Use of snuff at 32 weeks of gestation Maternal body weight at postpartum visit at ANC (kilograms)
  Maternal weight (in kilograms), last data entry after 35 gestational weeks Self-rated health during pregnancy
  Participated in prenatal education group (pregnant woman) Self-rated health postpartum
  Participated in prenatal education group (partner) Breast feeding at 4 weeks postpartum
  Counselling due to fear of childbirth  
  1. Variables presented in bold text were selected for the comparison of data in medical records and in MHCR.
  2. aGestational age at registration in ANC is calculated by the software program.
  3. bBody Mass Index (BMI) at registration in ANC is calculated by the software program.
  4. cFoetal growth proportionality – i.e., appropriate for gestational age (AGA), large for gestational age (LGA), and small for gestational age (SGA) – is calculated by the software program.
  5. dIn cases of multiple births, birth weight and gender are also registered for second twin.