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

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

	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) 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.

ISSN: 1472-6947