Table 1 Prevalence of potential preconceptional risk factors in East and West Berlin *
Potential risk factors | Control group | VLBW | ||
|---|---|---|---|---|
East Berlin n = 166 | West Berlin n = 175 | East Berlin n = 82 | West Berlin n = 84 | |
Obstetric history | ||||
previous preterm delivery | 4.8 | 8.0 | 15.9 | 14.3 |
previous fetal loss | 36.1 | 36.0 | 50.0 | 53.6 |
previous induced abortion | 21.7 | 20.6 | 29.3 | 31.0 |
assisted reproduction | 1.8 | 5.7 | 2.5 | 8.3 |
prima para | 49.4 | 51.4 | 51.2 | 56.0 |
Other maternal variables | ||||
low net income (< 800 DM/m) | 1.2 | 2.3 | 7.3 | 7.1 |
single mother | 16.3 | 4.6 | 31.7 | 20.2 |
school education | ||||
less than 10 years | 15.1 | 25.7 | 34.1 | 45.2 |
10 to 11 years | 57.8 | 37.1 | 51.2 | 28.6 |
at least 12 years | 27.1 | 37.1 | 13.4 | 26.2 |
single-room apartment | 9.0 | 3.4 | 18.3 | 10.7 |
unemployed during pregnancy | 19.9 | 6.9 | 35.4 | 16.7 |
migrant from developing country | 7.2 | 18.3 | 13.4 | 26.2 |
age less than 20 years | 5.4 | 1.7 | 8.5 | 4.8 |
age more than 35 years | 6.6 | 14.9 | 11.0 | 19.0 |
body mass index less than 20 | 34.5 | 22.5 | 31.6 | 20.0 |
body mass index more than 30 | 5.5 | 4.7 | 3.8 | 3.8 |
smoking during pregnancy | 26.5 | 26.9 | 40.7 | 44.0 |
Paternal variables | ||||
unemployment | 12.7 | 9.7 | 24.7 | 15.5 |
school education | ||||
less than 10 years | 15.3 | 28.9 | 30.4 | 40.7 |
10 to 11 years | 53.4 | 26.0 | 48.1 | 25.9 |
at least 12 years | 31.3 | 45.1 | 21.5 | 33.3 |