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Table 3 Comparison with population birth data of reported births in Stages 1 and 21 of the National Women's Health Study occurring since 19802

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

REGISTERED STILLBIRTH3      
   No. stillbirths3 Total livebirths & stillbirths3 SRSR4 (95% CI)  
Stage 1 1980–2002 102 18,740 115 (94 – 139)
Stage 2 1980–2002 59 12,061 102 (79 – 132)
MULTIPLE (REGISTERED) DELIVERY 5      
   No. multiple deliveries5 Total deliveries5 SMDR4 (95% CI)  
Stage 1 1980–2002 264 18,391 111 (99 – 126)
Stage 2 1980–2002 169 11,887 108 (93 – 126)
AVERAGE MATERNAL AGE AT FIRST 6 (LIVE)BIRTH (years)      
   No. first6 livebirths Mean (SD) age7 England & Wales8 Mean age  
Stage 1 Year of delivery     
  1980–84 1,724 25.2 (4.12) 25.5  
  1985–89 1,916 25.9 (4.56) 26.4  
  1990–94 2,058 27.1 (4.85) 27.8  
  1995–99 2,026 28.6 (5.01) 29.0  
  2000–02 699 29.4 (5.06) 29.6  
Stage 2 1980–84 1,032 25.5 (4.02) 25.5  
  1985–89 1,182 26.0 (4.45) 26.4  
  1990–94 1,325 27.3 (4.78) 27.8  
  1995–99 1,432 28.8 (4.81) 29.0  
  2000–02 540 29.7 (4.89) 29.6  
  1. 1 Stage 2 data are a subset of Stage 1 data (see methods). 2 Pregnancies with missing maternal age have been excluded from this analysis. 3 Registered stillbirths 1980–2002, defined as fetal death at ≥ 28 weeks prior to 1992, or at ≥24 weeks thereafter. 41 (40%) of stillbirths had no gestational age, but were described as stillbirths by the mother. Unit of analysis is a baby; multiple births counted as many times as there are babies. Denominator contains all reported livebirths and registered stillbirths 1980–2002. 4 Standardised Registered Stillbirth Ratio (SRSR) and Standardised registered Multiple Delivery Ratio (SMDR). Standardised for maternal age (5-year intervals) and single year of birth using data for England and Wales 1980–2002. 5 Unit of analysis is a delivery (pregnancy) containing one or more registered live or stillbirth; multiple pregnancies counted once only. Multiple pregnancies containing only one registered birth (with another non-registrable outcome, such as miscarriage) considered as singleton in this analysis. 6 First registered birth, if live. 7 NWHS data relates to livebirths both within and outside marriage 8 Livebirths within marriage only