Table 2. Proportion of residents with serologic evidence of chikungunya virus infection from communities with (intervention) or without (non-intervention) autocidal gravid ovitraps (AGO traps) by demographic and behavioral characteristics, Puerto Rico, November 2015–February 2016.
| Intervention Communities | Non-intervention Communities | PR (95% CI) | aPR† (95% CI) | |||||
|---|---|---|---|---|---|---|---|---|
| N | CHIKV+ Survey Participants, n (row %) |
Estimated Proportion CHIKV+ in Community* |
N | CHIKV+ Survey Participants, n (row %) |
Estimated Proportion CHIKV+ in Community* |
|||
| Overall | 175 | 44 (25.1) | 26.1 | 152 | 70 (46.1) | 43.8 | 0.60 (0.44–0.81) | 0.50 (0.37–0.91)‡ |
| Age group | ||||||||
| 5–19 | 13 | 5 (38.5) | 32.8 | 10 | 4 (40.0) | 47.9 | 0.68 (0.47–0.99) | 0.68 (0.48–0.97) |
| 20–49 | 50 | 15 (30.0) | 27.0 | 34 | 13 (38.2) | 39.7 | 0.68 (0.36–1.29) | 0.54 (0.33–0.89) |
| 50+ | 112 | 24 (21.4) | 17.2 | 108 | 53 (49.1) | 44.7 | 0.39 (0.25–0.59) | 0.34 (0.22–0.55) |
| Sex | ||||||||
| Male | 63 | 17 (27.0) | 25.9 | 59 | 25 (42.4) | 29.5 | 0.88 (0.53–1.46) | 0.90 (0.55–1.48) |
| Female | 112 | 27 (24.1) | 26.3 | 93 | 45 (48.4) | 56.5 | 0.47 (0.32–0.68) | 0.86 (0.52–1.43) |
| Weekly hours at home during daylight hours, median (range or 95% CI) | 175 | 63 (14–84) | 43.5 (39.0–55.8) | 151 | 76 (0–84) | 49.0 (44.5–56.0) | 0.0015§ | |
| 1–24 | 14 | 5 (35.7) | 40.6 | 10 | 4 (40.0) | 40.4 | 1.01 (0.39–2.58) | -- |
| 25–60 | 69 | 26 (37.7) | 31.3 | 52 | 21 (40.4) | 40.7 | 0.77 (0.53–1.11) | -- |
| 61–84 | 92 | 13 (14.1) | 10.3 | 89 | 45 (50.6) | 48.7 | 0.21 (0.11–0.41) | -- |
| Frequency of use of mosquito repellent since May 2014 | ||||||||
| Never | 66 | 16 (24.2) | 25.3 | 48 | 21 (43.8) | 40.2 | 0.63 (0.36–1.10) | 0.63 (0.36–1.09) |
| Daily | 15 | 5 (33.3) | 33.3 | 31 | 14 (45.2) | 53.9 | 0.62 (0.28–1.37) | 0.84 (0.36–1.95) |
| Occasionally | 92 | 22 (23.9) | 25.3 | 73 | 35 (47.9) | 40.9 | 0.62 (0.34–1.11) | 0.62 (0.35–1.10) |
Abbreviations: CHIKV = chikungunya virus; PR = prevalence ratio; aPR = adjusted prevalence ratio; 95% CI = 95% confidence interval; -- = PR could not be adjusted for the indicated variable
*Estimates for the entire community based on survey responses by age group and sex.
†Adjusted only by time spent at home during daylight hours
‡Adjusted by age, sex, and time spent at home during daylight hours
§Mood’s test for medians