Table 1.
Baseline characteristics and clinical factors of PCR negative and positive for pandemic H1N1 2009 influenza virus infection
| Variables | PCR negative n = 91 | PCR positive n = 75 | P value |
|---|---|---|---|
| Mean age (SD), years | 28·74 (21·10) | 24·71 (14·57) | 0·149 |
| Male, n (%) | 46 (50·55) | 30 (40·00) | 0·175 |
| Medical personnel, n | 17 (18·89) | 7 (9·33) | 0·083 |
| High risk for H1N1, n | 28 (31·11) | 17 (22·67) | 0·225 |
| Mean body weight (SD), kg | 57·01 (18·73) | 59·51 (13·56) | 0·424 |
| Mean height (SD), m | 1·62 (0·11) | 1·61 (0·11) | 0·701 |
| Mean BMI (SD), kg/m2 | 21·75 (6·65) | 23·23 (4·46) | 0·226 |
| History of contact with H1N1*, n | 26 (28·81) | 31 (41·33) | 0·094 |
| Chill, n | 10 (10·99) | 5 (6·67) | 0·334 |
| Cough, n | 82 (90·11) | 69 (92·00) | 0·673 |
| Sore throat, n | 39 (42·86) | 33 (44·00) | 0·882 |
| Conjunctivitis, n | 1 (1·10) | 6 (8·00) | 0·047 |
| Coryza, n | 47 (51·65) | 27 (36·00) | 0·044 |
| Body ache, n | 37 (40·66) | 40 (53·33) | 0·103 |
| Headache, n | 15 (16·48) | 21 (28·00) | 0·073 |
| Chest pain, n | 4 (4·40) | 2 (2·67) | 0·691 |
| Dyspnea, n | 11 (12·09) | 12 (16·00) | 0·468 |
| Stomachache, n | 10 (10·99) | 7 (9·33) | 0·726 |
| Diarrhea, n | 9 (9·89) | 6 (8·00) | 0·673 |
| Body temperature, °C | 38·50 (1·14) | 38·81 (1·00) | 0·076 |
| Pulse rate, beats/minutes | 103·09 (12·09) | 103·70 (12·21) | 0·750 |
| Respiratory rate, times/minutes | 26·08 (10·11) | 23·53 (6·82) | 0·061 |
| Duration of fever, days | 2·57 (1·52) | 2·63 (1·35) | 0·807 |
| Blood test | |||
| Mean total white blood count, cells/mm3 (SD) | 8857·59 (4770·56) | 8020·59 (4210·10) | 0·337 |
| Leukopenia, n | 7 (12·07) | 6 (11·76) | 0·961 |
| Leukocytosis, n | 16 (27·59) | 12 (23·53) | 0·629 |
| Band, % | 3·43 (4·33) | 3·21 (4·25) | 0·749 |
| PMN, % | 45·29 (33·05) | 51·27 (33·43) | 0·251 |
| Lymphocytes, % | 18·76 (18·41) | 22·50 (71·85) | 0·664 |
| Platelet count 100 000–144 000/μl, n | 12 (20·69) | 3 (6·00) | 0·028 |
| Platelet count <100 000/μl, n | 5 (8·62) | 3 (6·00) | 0·722 |
PCR, polymerase chain reaction.
Data presented in numbers, n (%) unless indicated. Total number in PCR‐negative and PCR‐positive group may not equal 91 and 75, respectively because of missing data. *indicating history of contact with laboratory‐confirmed patients with H1N1.