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Table 3 Background characteristics of IVF mothers in the MBR and in the IVF research data, Finland 1996–1998, %1)

From: Monitoring of IVF birth outcomes in Finland: a data quality study

  MBR IVF research data p
Deliveries 3557 3594  
Age at birth, years    0.029
Less than 25 years 2.9 2,9  
25–29 19.0 17.3  
30–34 40.7 40.7  
35–39 29.4 29.4  
40 or more 8.1 9.7  
Mean age 33.6 33.9 0.005
SD 4.5 4.5  
Single mother 3.8 2.9 0.024
Number of previous pregnancies   0.744
0 50.0 49.5  
1 26.1 26.3  
2 12.4 12.0  
3 or more 11.5 12.2  
Number of previous births    0.299
0 70.8 72.0  
1 22.0 21.4  
2 5.1 4.3  
3 or more 2.1 2.3  
Smoked during pregnancy 7.1 6.5 0.339
Socioeconomic position    < 0.001
Upper white-collar 24.9 26.7  
Lower white-collar 48.7 49.6  
Blue-collar 13.3 14.9  
Other2) 13.1 8.8  
  1. 1) No information available in the IVF statistics. 2) Including entrepreneurs, farmers, students, unemployed, retired, housewives and others for whom no social class could be stated.