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Table 1 Characteristics of nulliparous women, WSLHD, 2011-2014. All data are presented as a number (%)

From: Prediction of pre-eclampsia in nulliparous women using routinely collected maternal characteristics: a model development and validation study

Characteristics

Total (N = 12,395)

PE (N = 293)

No PE (N = 12,102)

Socio-demographic and current pregnancy factors

Australian/New Zealand-born English speakers

  No

8271 (66.7)

141 (48.1)

8130 (67.2)

  Yes

4124 (33.3)

152 (51.9)

3972 (32.8)

Socioeconomic statusa

  High

8594 (69.3)

221 (75.4)

8373 (69.2)

  Low

3801 (30.7)

72 (24.6)

3729 (30.8)

Conception method

  Natural

11,684 (94.3)

259 (88.4)

11,425 (94.4)

  Assistedb

711 (5.7)

34 (11.6)

677 (5.6)

Maternal age (years)

   ≤ 24

3678 (29.7)

86 (29.4)

3592 (29.7)

  25–29

5067 (40.9)

85 (29.0)

4982 (41.2)

  30–34

2848 (23.0)

87 (29.7)

2761 (22.8)

   ≥ 35

802 (6.5)

35 (11.9)

767 (6.3)

Body mass index (kg/m2)

   ≤ 24

8255 (66.6)

150 (51.2)

8105 (67.0)

  25–29

2646 (21.3)

58 (19.8)

2588 (21.4)

  30–34

960 (7.7)

37 (12.6)

923 (7.6)

   ≥ 35

534 (4.3)

48 (16.4)

486 (4.0)

Smoking status

  Non-smokers

11,736 (94.7)

276 (94.2)

11,460 (94.7)

  Current smokers

659 (5.3)

17 (5.8)

642 (5.3)

Medical history

Autoimmune diseasec

  No

12,385 (99.9)

292 (99.7)

12,093 (99.9)

  Yes

10 (0.1)

1 (0.3)

9 (0.1)

Chronic hypertension

  No

12,296 (99.2)

274 (93.5)

12,022 (99.3)

  Yes

99 (0.8)

19 (6.5)

80 (0.7)

Chronic renal disease

  No

12,286 (99.1)

279 (95.2)

12,007 (99.2)

  Yes

109 (0.9)

14 (4.8)

95 (0.8)

Diabetes mellitus (type 1 or 2)

  No

12,326 (99.4)

289 (98.6)

12,037 (99.5)

  Yes

69 (0.6)

4 (1.4)

65 (0.5)

Multiple pregnancy

  No

12,087 (97.5)

265 (90.4)

11,822 (97.7)

  Yes

308 (2.5)

28 (9.6)

280 (2.3)

Family history

Family history of PE

  No

12,361 (99.7)

289 (98.6)

12,072 (99.8)

  Yes

34 (0.3)

4 (1.4)

30 (0.2)

  1. aAustralian Bureau of Statistics Socio-Economic Index for Australia (SEIFA) advantage/disadvantage by postcode classification. Low socioeconomic status = SEIFA scores 1-2; high socioeconomic status = SEIFA scores 3-5.
  2. bAssisted by use of medications or fertilization procedures (includes intrauterine insemination, in-vitro fertilization and intracytoplasmic sperm injection).
  3. cAutoimmune disease includes systemic lupus erythematosus and antiphospholipid syndrome.
  4. PE Pre-eclampsia