Background conditions observed in pregnant study subjects immunised against influenza
| Background condition | Group I Agrippal S1 | Group II Grippol Plus | Group III Placebo |
| Total subjects | 37 | 42 | 41 |
| Anaemia of pregnancy | 17 (45.9) | 19 (45.2) | 25 (60.9) |
| Chronic genitourinary infections | 13 (35.1) | 15 (35.7) | 17 (41.5) |
| Thyroid disorders | 10 (27.0) | 9 (21.4) | 12 (29.3) |
| Neuro-circulatory dystonia syndrome | 9 (24.3) | 10 (23.8) | 12 (29.3) |
| Threatening miscarriage | 13 (35.1) | 12 (32.4) | 21 (51.2) |
Data are presented as n or n (%). Note that p>0.05 for the differences between the compared groups.