Table 3. Demographic and clinical features of A/H1N1 2009pdm, seasonal influenza, and non-influenza respiratory infections in 2009/2010 influenza season.
| Parameters | I. A(H1N1) 2009 | II. Seasonal influenza viruses | III. Other common respiratory viruses | Statistical analysis | ||
| I vs II | I vs III | II vs III | ||||
| No. of patients | 261 | 218 | 199 | |||
| Age range (year) | 14−64 | 14−78 | 15−83 | |||
| No. of age 14−25 | 127 (48.7) b | 75 (34.4) | 66 (33.2) | ÷2 = 9.898, P<0.05 | ÷2 = 11.129, P<0.05 | |
| No. of age 26−65 | 132 (50.6) | 117 (53.7) | 117 (58.8) | |||
| No. of age >65 | 0 (0.0) | 24 (11.0) | 15 (7.5) | ÷2 = 30.250, P<0.05 | ÷2 = 20.337, P<0.05 | |
| No. of age unknown | 2 (0.8) | 2 (0.9) | 1 (0.5) | |||
| Age mean/median (year) | 27.5/26.0 | 32.7/27.0 | 35.5/30.0 | P = 1.890×10−5<0.05(meanvs mean)c | P = 2.840×10−9<0.05(meanvs mean)c | P = 0.048<0.05(meanvs mean)c |
| Gender (M/F) | 123/138(47.1/52.9) | 104/114(47.7/52.3) | 89/110(44.7/55.3) | |||
| URTIs/LRTIs a | 261/0 (100.0/0.0) | 218/0 (100.0/0.0) | 198/1 (99.5/0.5) | |||
| Clinical symptoms | ||||||
| Cough | 235 (90.0) | 170 (78) | 95 (47.7) | ÷2 = 13.219, P<0.05 | ÷2 = 99.648, P<0.05 | ÷2 = 41.078, P<0.05 |
| Headache | 153 (58.6) | 169 (77.5) | 160 (80.4) | ÷2 = 19.262, P<0.05 | ÷2 = 24.635, P<0.05 | |
| Sore throat | 167 (64.0) | 151 (69.3) | 126 (63.3) | |||
| Muscle pain | 124 (47.5) | 129 (59.2) | 111 (55.8) | ÷2 = 6.486, P<0.05 | ||
| Chilly | 97 (37.2) | 133 (61) | 99 (49.7) | ÷2 = 27.057, P<0.05 | ÷2 = 7.312, P<0.05 | ÷2 = 5.344, P<0.05 |
| Running nose | 85 (32.6) | 92 (42.2) | 82 (41.2) | ÷2 = 4.733, P<0.05 | ||
| Sputum production | 88 (33.7) | 84 (38.5) | 40 (20.1) | ÷2 = 10.423, P<0.05 | ÷2 = 16.915, P<0.05 | |
| Sneezing | 52 (19.9) | 68 (31.2) | 69 (34.7) | ÷2 = 8.034, P<0.05 | ÷2 = 12.672, P<0.05 | |
| Peripheral blood tests | ||||||
| Mean leukocyte count (×109/L) | 6.5±1.7 | 6.1±1.8 | 7.2±1.9 | P = 0.014<0.05c | P = 1.443×10−5<0.05c | P = 8.592×10−10<0.05c |
a
Upper respiratory tract infections/Lower respiratory tract infections;
b
Numbers in parentheses are the percentages of infection in total samples;
c
Statistical method: student’s t-test.