Table 4. Results of multivariate analyses for factors associated with 6 clinical signs of virus positive in outpatients, Shanghai, China*, 2011–2013.
| Clinical sign of ILI§. | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Factors | Cough | Sore throat | Running nose | ||||||
| Yes, n = 494 | No, n = 144 | OR(95% CI),p value | Yes, n = 347 | No, n = 291 | OR(95% CI),p value | Yes, n = 309 | No, n = 329 | OR(95% CI),p value | |
| other viral positive | 174 (35.2) | 71 (49.3) | Ref | 133 (38.3) | 112 (38.5) | Ref | 109 (35.3) | 136 (41.3) | Ref |
| Flu viral positive | 320 (64.8) | 73 (50.7) | 1.99(1.60–2.47),<0.001 | 214 (61.7) | 179 (61.5) | 1.22(1.01–1.48), 0.038 | 200 (64.7) | 193 (58.7) | 1.62(1.34–1.96), <0.001 |
| Age<5y | 95 19.2) | 10 (6.9) | 3.22(2.34–4.42), <0.001 | 39 (11.2) | 66 (22.7) | 0.39(0.31–0.50), <0.001 | 62 (20.1) | 43 (13.1) | 1.90(1.50–2.41), <0.001 |
| Male | 243 (49.2) | 71 (49.3) | 1.08(0.89–1.31),0.432 | 169 (48.7) | 145 (49.8) | 0.96(0.81–1.15),0.682 | 152 (49.2) | 162 (49.2) | 0.99(0.83–1.19),0.907 |
| Interval 2d# | 38 7.7 | 10(6.9) | 1.38(0.94–2.01),0.102 | 298.4 | 196.5 | 1.71(1.21–2.42), 0.002 | 247.8 | 247.3 | 0.99(0.70–1.40),0.955 |
| Factors | Fatigue | Headache | Temperature※ | ||||||
| Yes, n = 228 | No, n = 410 | OR(95% CI),p value | Yes, n = 199 | No, n = 439 | OR(95% CI),p value | >39°C, n = 102 | ≤39°C, n = 534 | OR(95% CI),p value | |
| other viral positive | 67 (29.4) | 178 (43.4) | Ref | 60 (30.2) | 185 (42.1) | Ref | 2322.5 | 22241.6 | Ref |
| Flu viral positive | 161 (70.6) | 232 (56.6) | 1.25(1.02–1.53), 0.028 | 139 (69.8) | 254 (57.9) | 1.24(1.01–1.52),0.043 | 7977.5 | 31258.4 | 1.40(1.07–1.83),0.015 |
| Age<5y | 10.4 | 104(25.4) | 0.020.01–0.05), <0.001 | 1 (0.5) | 104(23.7) | 0.010.003–0.05), <0.001 | 1918.6 | 8616.1 | 1.31(0.95–1.82), 0.104 |
| Male | 111 (48.7) | 203(49.5) | 0.96(0.79–1.16),0.662 | 99 (49.7) | 215 (49.0) | 0.92(0.76–1.12),0.413 | 45 (44.1) | 268 (50.2) | 0.95(0.73–1.23),0.682 |
| Interval 2d# | 33 (14.5) | 15 (3.7) | 3.15(2.24–4.43),<0.001 | 26 (13.1) | 225.0 | 2.04(1.45–2.87), <0.001 | 87.8 | 407.5 | 0.830.49–1.390.474 |
*Six multivariate unconditional logistic regression analyses were separately conducted to examine factors for each clinical sign of ILI. ILI outpatients from whom influenza viral were detected positive by RT-PCR as confirmed influenza patients, and from whom other respiratory viral were detected positive by RT-PCR as confirmed other respiratory viral infection patients. Boldface font indicates statistical. OR, odds ratio; Ref, reference.
§Data are number (%) outpatients unless otherwise indicated.
#Interval between illness onset and hospital visit.
※Total of 2(0.2%)outpatients missing information on temperature results in the Influenza virus positive ILI-case group.