Table 2. Demographic characteristics of febrile patients with serologic evidence of acute or past chikungunya infection vs. no serologic evidence of chikungunya, Southern Sri Lanka, 2007 * .
| Demographic Characteristics | Chikungunya (n=40) | No chikungunya (n=757) | P value† |
|---|---|---|---|
| Age in years, median (IQR) | 41.6 (27.8-51.8) | 30.3 (18.5-47.7) | 0.01 |
| Male | 80.0 | 59.7 | 0.01 |
| Residence | 0.03 | ||
| Rural | 82.5 | 92.1 | |
| Urban | 17.5 | 7.9 | |
| Type of Work | 0.01 | ||
| Home | 23.1 | 26.9 | |
| Laborer | 28.2 | 25.3 | |
| Farmer, e.g. rice paddy | 2.6 | 2.7 | |
| Merchant | 10.3 | 2.7 | |
| Student | 5.1 | 23.1 | |
| Other | 30.8 | 19.3 | |
| Swim/Bathe/Wade | 0.93 | ||
| None | 76.9 | 74.2 | |
| River | 10.3 | 13.0 | |
| Paddy Field | 10.3 | 10.2 | |
| Pond/Lake | 0 | 1.1 | |
| Other | 2.6 | 1.6 | |
| Water Source | 0.05 | ||
| Tap | 50.0 | 29.5 | |
| Boiled | 7.5 | 9.6 | |
| Well | 42.5 | 60.3 | |
| Other | 0.0 | 0.7 |
*
Except for median age, data are percentages. IQR, intraquartile range
†
Kruskal-Wallis test to compare proportions across groups.