Table 1.
ICD codes used to identify diagnoses in this study
| Description | ICD 10 | ICD 9 |
|---|---|---|
| Maternal infections | ||
| Infections of genitourinary tract in pregnancy | O23 | 646.60, 646.61, 646.62, 646.63 |
| Infections of amniotic sac and membranes | O41.1 | 658.41, 658.43 |
| Pyrexia during labour, not elsewhere classified | O75.2 | 659.21 |
| Other infection during labour | O75.3 | 659.31 |
| Premature rupture of the membrane | ||
| Premature rupture of the membrane, onset of labour | O42 | |
| Neonatal infections | ||
| Pneumonia | P23 | 770.0 |
| Sepsis | P36 | 771.81 |
| Other neonatal infections | P39 | 771.5, 771.6, 771.82, 771.89 |
ICD International Classification of Diseases
The Swedish ICD system used was constructed based on the ICD classification of the World Health Organization