Table 4.
Spontaneous and medically indicated (iatrogenic) preterm birth, miscarriage, and intrauterine death
| Type of birth | No in intervention group (%) | No in control group (%) | Difference (95% CI) | P value (χ2 test) |
|---|---|---|---|---|
| Birth at term | 1955 (95.0) | 1947 (92.8) | −2.1 (−3.6 to −0.7) | 0.004 |
| Spontaneous preterm birth (<37 weeks of gestation) | 61 (3.0) | 112 (5.3) | 2.4 (1.2 to 3.6) | 0.0001 |
| Medically indicated (iatrogenic) preterm birth* | 24 (1.2) | 14 (0.7) | −0.5 (−1.1 to 0.1) | 0.091 |
| Intrauterine death | 10 (0.5) | 9 (0.4) | −0.1 (−0.5 to 0.4) | 0.786 |
| Miscarriage† | 8 (0.4) | 15 (0.7) | 0.3 (−0.1 to 0.8) | 0.156 |
| Total | 2058 (100.0) | 2097 (100.0) | ||
| Medically indicated (iatrogenic) preterm birth due to* : | ||||
| Pre-eclampsia | 9 (0.4) | 8 (0.4) | ||
| HELLP (haemolysis, elevated liver, low platelet) syndrome | 4 (0.2) | 1 (0.0) | ||
| Severe intrauterine growth retardation | 3 (0.1) | 0 | ||
| Fetal malformation | 2 (0.1) | 2 (0.1) | ||
| Placental abnormalities (placenta praevia, placental abruption) | 4 (0.2) | 3 (0.1) | ||
| Non-obstetrical causes (appendicitis, peritonitis) | 2 (0.1) | 0 | ||
| Miscarriage by weeks of gestation† | ||||
| 16-20 weeks | 4 (0.2) | 11 (0.5) | ||
| >20 weeks | 4 (0.2) | 4 (0.2) |
*
Medically indicated preterm birth, listing the different diagnoses for iatrogenic induced preterm births.
†
Explains the two different groups.