Table 4
Characteristics of infected women, for those who delivered preterm and those who delivered at term. Values are numbers (percentages) unless stated otherwise
| Characteristic | Preterm (n=59) | Not preterm (n=131)* | P value |
|---|---|---|---|
| Trimester of infection: | 0. 046† | ||
| First (0-11 weeks) | 0 (0) | 10 (8) | |
| Second (12-23 weeks) | 8 (14) | 24 (18) | |
| Third (≥24 weeks) | 51 (86) | 97 (74) | |
| Median (interquartile range) No of symptoms‡ at presentation | 4 (3-5) | 5 (3-6) | 0.09§ |
| Median (interquartile range) days before start of treatment | 3 (1-7) | 3 (1-6) | 0.46† |
| Treated within 2 days of infection: | |||
| Yes | 28 (53) | 69 (57) | 0.61 |
| No | 25 (47) | 52 (43) | |
| Immunised against 2009/H1N1: | |||
| Yes | 2 (4) | 7 (6) | 0.72§ |
| No | 54 (96) | 119 (94) | |
| Admitted to intensive care unit: | |||
| Yes | 32 (54) | 16 (12) | <0.001 |
| No | 27 (46) | 115 (88) | |
| Pneumonia as secondary infection: | |||
| Yes | 12 (20) | 5 (4) | 0.001† |
| No | 47 (80) | 126 (96) | |
| Asthma: | |||
| Yes | 9 (15) | 18 (14) | 0.78 |
| No | 50 (85) | 113 (86) | |
| Other comorbidity: | |||
| Yes | 15 (25) | 23 (18) | 0.21 |
| No | 44 (75) | 108 (82) | |
| Delivered by caesarean section: | |||
| Yes | 42 (72) | 39 (30) | <0.001 |
| No | 16 (28) | 92 (70) | |
| Indication for caesarean section: | |||
| Maternal influenza infection | 22 (52) | 3 (8) | <0.001† |
| Other | 20 (48) | 36 (92) |
*Considering only those women with birth after 37 weeks who had confirmed infection before 37 weeks.
†Fisher’s exact test.
‡Fever, cough, sore throat, headache, tiredness/lethargy, limb or joint pain, diarrhoea, breathlessness, vomiting, rhinorrhoea.
§Wilcoxon rank sum test.