Table 5. Comparison on the demographic and clinical characteristics of patients infected by influenza B Victoria and Yamagata lineages.
| Victoria Lineage | Yamagata Lineage | Yamagata vs Victoria (ref.) | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Characteristics | (n = 56) | (n = 114) | p | OR (95% CI) | B | SE | p | aOR | 95% CI | |
| Demographic Features | ||||||||||
| Mean (± S.D.) age in years | 32.11 ± 16.18 | 43.58 ± 18.22 | <0.001 a | - | - | - | - | - | - | |
| No. (%) of patients≤ 24 yrs old | 21 (37.5) | 20 (17.5) | 0.006 b | - | ref. | 0.085 c | ref. | |||
| No. (%) of patients25-55 yrs old | 27 (48.2) | 35 (30.7) | - | 0.576 | 0.459 | 0.210 c | 1.779 | 0.723–4.377 | ||
| No. (%) of patients≥ 56 years old | 8 (14.3) | 59 (51.8) | - | 1.466 | 0.662 | 0.027 c | 4.33 | 1.184–15.838 | ||
| Clinical Features | ||||||||||
| Median (IQR) days onset of symptoms | 4 (2–6) | 4 (3–5) | 0.670 a | - | -0.032 | 0.089 | 0.722 c | 0.969 | 0.814–1.153 | |
| No. (%) of patients with: | ||||||||||
| Sneezing | Yes | 44 (78.6) | 81 (71.1) | 0.296 b | 1.49 (0.70–3.18) | -0.497 | 0.522 | 0.341 c | 0.608 | 0.219–1.692 |
| No | 12 (21.4) | 33 (28.9) | ref. | ref. | ||||||
| Nasal Discharge | Yes | 43 (76.8) | 88 (77.2) | 0.953 b | 0.98 (0.46–2.09) | 0.565 | 0.523 | 0.280 c | 1.76 | 0.631–4.910 |
| No | 13 (23.2) | 26 (22.8) | ref. | ref. | ||||||
| Nasal Congestion | Yes | 44 (78.6) | 71 (62.3) | 0.033 b | 2.22 (1.06–4.67) | -1.042 | 0.513 | 0.042 c | 0.353 | 0.139–0.963 |
| No | 12 (21.4) | 43 (37.7) | ref. | ref. | ||||||
| Headache | Yes | 40 (71.4) | 89 (78.1) | 0.341 b | 0.70 (0.34–1.46) | 1.282 | 0.514 | 0.013 c | 3.603 | 1.316–9.896 |
| No | 16 (28.6) | 25 (21.9) | ref. | ref. | ||||||
| Sore throat | Yes | 46 (82.1) | 74 (64.9) | 0.02 b | 2.49 (1.14–5.45) | -1.42 | 0.542 | 0.009 c | 0.242 | 0.084–0.699 |
| No | 10 (17.9) | 40 (35.1) | ref. | ref. | ||||||
| Hoarseness of voice | Yes | 43 (76.8) | 93 (81.6) | 0.463 b | 0.75 (0.34–1.63) | 0.874 | 0.523 | 0.095 c | 2.398 | 0.860–6.683 |
| No | 13 (23.2) | 21 (18.4) | ref. | ref. | ||||||
| Muscle ache | Yes | 45 (80.4) | 97 (85.1) | 0.434 b | 0.72 (0.31–1.66) | -0.467 | 0.583 | 0.423 c | 0.627 | 0.200–1.964 |
| No | 11 (19.6) | 17 (14.9) | ref. | ref. | ||||||
| Cough | Yes | 54 (96.4) | 109 (95.6) | 0.802 b | 1.24 (0.23–6.60) | -0.681 | 1.059 | 0.520 c | 0.506 | 0.064–4.032 |
| No | 2 (3.6) | 5 (4.4) | ref. | ref. | ||||||
n: number of patients; OR: odds ratio; CI: confidence interval; B: coefficient; SE: standard error; SD: standard deviation; aOR: adjusted odds ratio; ref: reference group; p: level of significance (2-tailed) at the 0.05 level
ap-value calculated by Independent Samples t-Test
bp-value calculated by Pearson’s Chi-square test/Fischer’s Exact test
cp-value calculated by Binary Logistic Regression