Table 3.
Selected demographic and clinical characteristics of tested patients, by laboratory confirmation status, Poland, July 2009–April 2011
| Negative (n = 944) | Confirmed by PCR (n = 10) | Confirmed by ELISA (n = 278) | |
|---|---|---|---|
| Age group (years), n (%) | |||
| 3–19 | 265 (28·1) | 3 (30·0) | 61 (21·9) |
| 20–39 | 267 (28·3) | 5 (50·0) | 58 (20·9) |
| 40–59 | 250 (26·5) | 0 | 88 (31·7) |
| ⩾60 | 162 (17·2) | 2 (20·0) | 71 (25·5) |
| Sex, n (%) | |||
| Male | 347 (36·8) | 0 | 114 (41·0) |
| Female | 597 (63·2) | 10 (100·0) | 164 (59·0) |
| Duration of cough in days, mean (s.d.) | 31·9 (18·4) | 26·4 (22·5) | 35·4 (19·3) |
| Type of cough, n (%) | |||
| Paroxysms | 916 (97·0) | 10 (100·0) | 264 (95·0) |
| Mainly at night | 522 (55·3) | 6 (60·0) | 161 (57·9) |
| Whoops | 140 (14·8) | 1 (10·0) | 62 (22·3) |
| Apnoea | 283 (30·0) | 4 (40·0) | 85 (30·6) |
| Concomitant symptoms, n (%) | |||
| Fever | 206 (23·4) | 1 (10·0) | 59 (22·5) |
| Accompanied by vomiting | 132 (15·0) | 0 | 36 (13·7) |
| Wheezing | 173 (19·6) | 0 | 55 (21·0) |
| Aphagia | 82 (9·3) | 0 | 24 (9·2) |
| Anorexia | 36 (4·1) | 0 | 14 (5·3) |
| Vaccinated against pertussis, n (%) | |||
| >10 years before symptom onset | 88 (10·0) | 1 (10·0) | 31 (11·8) |
| 5–10 years before onset | 33 (3·7) | 0 | 13 (5·0) |
| <5 years before onset | 156 (17·7) | 2 (20·0) | 20 (7·6) |
| Current smoker, n (%) | |||
| <10 cigarettes/day | 71 (8·0) | 1 (10·0) | 25 (9·5) |
| 10–20 cigarettes/day | 72 (8·2) | 0 | 31 (11·8) |
| >20 cigarettes/day | 23 (2·6) | 0 | 8 (3·1) |