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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