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Table 2 NWHS Stages 1 and 2 – description of women reporting one or more pregnancy, and of the pregnancies they reported

From: The National Women's Health Study: assembly and description of a population-based reproductive cohort

 

STAGE 1

STAGE 2

 

n

(%)

n

(%)

TOTAL NO. WOMEN IN ANALYSIS

12,695

(100)

7508

(100)

Age at survey (years)

    

   <30

1247

(9.8)

685

(10.6)

   30–34

2007

(15.8)

1284

(20.6)

   35–39

2618

(20.6)

1629

(28.6)

   > = 40

6678

(52.6)

3910

(39.3)

   Not known

145

(1.1)

-

 

   Mean age (SD) 1

40.5 (8.45)

 

40.4 (8.24)

 

Year of first pregnancy

    

   <1980

3201

(25.2)

1798

(24.0)

   1980–84

1902

(15.0)

1131

(15.1)

   1985–89

2091

(16.5)

1259

(16.8)

   1990–94

2158

(17.0)

1356

(18.1)

   1995–99

2079

(16.4)

1406

(18.7)

   2000–02

7882

(6.2)

5583

(7.4)

   Not known

476

(3.8)

-

 

Total number of pregnancies reported per woman

    

   1

2607

(20.5)

1403

(18.7)

   2

5077

(40.0)

3162

(42.1)

   3

2962

(23.3)

1749

(23.3)

   4

1573

(12.4)

818

(10.9)

   5

285

(2.2)

229

(3.1)

   > = 6

191

(1.5)

147

(1.9)

   Median (range)

2 (1 – 18)

 

2 (1 – 18)

 

Pregnancy history

    

No dates given for any pregnancies

436

(3.4)

-

 

All pregnancies occurred before 1980

1495

(11.8)

853

(11.4)

Pregnancies before and after 1980

1707

(13.5)

945

(12.6)

Pregnancy history commenced 1980 onwards

9057

(71.3)

5710

(76.1)

   All pregnancies conceived after 31/03/2000

486

(3.8)

329

(4.4)

TOTAL REPORTED PREGNANCIES

30661

(100)

18391

(100)

Outcome of pregnancy

    

Livebirth, surviving >7 days

24081

(78.9)

14782

(80.4)

Livebirth, early neonatal death

95

(0.3)

56

(0.3)

Stillbirth

188

(0.6)

110

(0.6)

Miscarriage4

3512

(11.5)

2326

(12.7)

Ectopic

226

(0.7)

102

(0.6)

Termination for medical reasons5

312

(1.0)

89

(0.5)

Termination for non-medical reasons6

1424

(4.6)

562

(3.1)

Molar pregnancy

47

(0.2)

26

(0.1)

Ongoing (current) pregnancy

482

(1.6)

338

(1.8)

Not known

294

(1.0)

-

 

Year of pregnancy end

    

<1980

6093

(19.9)

3486

(18.0)

1980–84

4503

(14.7)

2623

(14.3)

1985–89

5028

(16.4)

3000

(16.3)

1990–94

5549

(18.1)

3434

(18.7)

1995–99

5808

(18.9)

3865

(21.0)

2000–02

27217

(8.9)

19838

(10.8)

Not known

959

(3.1)

-

 
  1. 1 Where date of birth given 2 Includes 486 women whose first pregnancy was conceived after 31st March 2000, 126 of whom were currently pregnant for the first time at time of survey 3 Includes 329 women whose first pregnancy was conceived after 31st March 2000, 73 of whom were currently pregnant for the first time at time of survey 4 Fetal death at <24 weeks gestation. Includes missed miscarriages (fetal death at <24 weeks without spontaneous expulsion of fetus) and blighted ova (anembryonic pregnancy) 5 Termination of pregnancy because of a defect identified in the baby, or because continuing the pregnancy would put the mother's health at risk 6 Termination of pregnancy for reasons other than a defect identified in the baby or risk to mother's health 7 1,718 of these pregnancies were conceived after 31st March 2000 8 1,232 of these pregnancies were conceived after 31st March 2000