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Table 3 Characteristics of pregnant admissions by influenza subtype/lineage

From: Epidemiology of influenza in pregnant women hospitalized with respiratory illness in Moscow, 2012/2013–2015/2016: a hospital-based active surveillance study

Characteristic A(H1N1)pdm09 A(H3N2) B/Yamagata B/Victoria P-value
N = 361 N = 224 N = 106 N = 76
Age group, n (%)      0.028
 15–19 years 11 (3.0) 10 (4.5) 2 (1.9) 2 (2.6)  
 20–24 years 69 (19.1) 40 (17.9) 17 (16.0) 19 (25.0)  
 25–29 years 146 (40.4) 95 (42.4) 31 (29.2) 30 (39.5)  
 30–34 years 91 (25.2) 51 (22.8) 31 (29.2) 23 (30.3)  
 35–39 years 37 (10.2) 21 (9.4) 18 (17.0) 1 (1.3)  
 40–44 years 7 (1.9) 7 (3.1) 7 (6.6) 1 (1.3)  
Age (years), median (range) 29 (17–44) 28 (15–43) 30 (19–42) 28 (19–45) 0.004
Underlying conditions a, n (%)
 None 300 (83.1) 182 (81.3) 92 (86.8) 63 (82.9) 0.666
 One or more 61 (16.9) 42 (18.8) 14 (13.2) 13 (17.1) 0.666
 Cardiovascular disease 16 (4.4) 7 (3.1) 1 (0.9) 3 (3.9) 0.376
 Chronic obstructive pulmonary disease 7 (1.9) 5 (2.2) 0 (0.0) 0 (0.0) 0.276
 Asthma 4 (1.1) 3 (1.3) 1 (0.9) 1 (1.3) 0.988
 Renal impairment 31 (8.6) 20 (8.9) 7 (6.6) 8 (10.5) 0.819
 Cirrhosis 3 (0.8) 2 (0.9) 2 (1.9) 1 (1.3) 0.803
 Neoplasm 2 (0.6) 0 (0.0) 0 (0.0) 0 (0.0) 0.521
Trimester of pregnancy, n (%)      0.005
 First (0–13 weeks) 87 (24.1) 46 (20.5) 17 (16.0) 11 (14.5)  
 Second (14–26 weeks) 167 (46.3) 81 (36.2) 44 (41.5) 40 (52.6)  
 Third (27–42 weeks) 106 (29.4) 97 (43.3) 45 (42.5) 25 (32.9)  
 Gestational age at admission (weeks), median (range) 21 (2–41) 25 (4–40) 24 (7–41) 27 (7–38) 0.017
Time from onset of symptoms to swabbing, n (%)
 0–2 days 263 (72.9) 167 (74.6) 57 (53.8) 42 (55.3) 0.001
 3–4 days 83 (23.0) 48 (21.4) 47 (44.3) 29 (38.2)  
 5–7 days 15 (4.2) 9 (4.0) 2 (1.9) 5 (6.6)  
 Days from onset of symptoms to swabbing, median (range) 2 (0–7) 2 (0–6) 2 (0–5) 2 (0–6) 0.001
  1. Abbreviation: NC not calculated
  2. aDiabetes, neuromuscular disease, and rheumatic disease are not listed because of low numbers