Table 3.
Logistic regression and temporal trends analysis of dengue case rates by demographic characteristics, Iquitos, Peru, 1993–1999
| Characteristics | Total dengue cases | Periods | Average annual change† | ||||||
|---|---|---|---|---|---|---|---|---|---|
| 1993* | 1994 | 1995 | 1996 | 1997 | 1998 | (Oct. 93–Sept. 99) | |||
| % N | % (n) | % (n) | % (n) | % (n) | % (n) | % (n) | % | (95% Cl) | |
| No. of cases | 14.6 (967) | 5.7 (15) | 25.2 (178) | 6.2 (29) | 2.7 (21) | 15.0 (382) | 18.5 (342) | 6.7§ | (1.5–12.1) |
| Gender | |||||||||
| Female | 17.5 (463)‖ | 5.9 (6) | 28.9 (84) | 8.4 (15) | 4.3 (8) | 18.3 (203)‖ | 18.8 (147) | 3.6 | (–3.6 to 11.3) |
| Male | 12.7 (504) | 5.6 (9) | 22.7 (94) | 4.8 (14) | 2.2 (13) | 12.4 (179) | 18.2 (195) | 9.3§ | (2.0–17.2) |
| Age groups (in years) | |||||||||
| 1–14 | 11.4 (114)‖ | 3.8 (2) | 16.5 (20)‖ | 2.9 (2) | 1.0 (1) | 13.2 (53) | 14.2 (36) | 19.3§ | (2.6–38.7) |
| 15–29 | 13.9 (443) | 6.7 (7) | 20.9 (62) | 5.7 (13) | 2.9 (15) | 16.3 (191) | 18.1 (155) | 12.2§ | (3.5–21.4) |
| 30–44 | 16.5 (240) | 7.6 (4) | 29.7 (51) | 8.3 (9) | 5.5 (5) | 14.4 (85) | 19.5 (86) | −0.4 | (–9.4 to 9.6) |
| > 44 | 17.9 (169) | 4.2 (2) | 38.9 (45) | 8.1 (5) | 0 (0) | 14.4 (53) | 21.8 (65) | −2.2 | (–12.2 to 8.9) |
| Occupations | |||||||||
| Child/student | 14.8 (256)‖ | 4.2 (3) | 24.4 (42)‖ | 7.3 (8)§ | 2.1 (3)§ | 16.3 (123)‖ | 16.2 (77)§ | 2.1 | (–7.8 to 13.0) |
| Housekeeper | 18.7 (269) | 6.5 (3) | 40.4 (55) | 5.6 (5) | 2.8 (2) | 17.3 (108) | 20.5 (96) | −3.7 | (–12.4 to 6.0) |
| Agricultural workers | 7.2 (34) | 6.7 (1) | 11.8 (4) | 2.9 (1) | 2.3 (1) | 5.5 (11) | 11.2 (16) | 9.9 | (–18.6 to 48.4) |
| Military personnel | 5.5 (53) | 9.8 (5) | 3.8 (4) | 0.8 (1) | 1.3 (5) | 8.0 (11) | 14.7 (27) | 42.4§ | (11.3–82.0) |
| Others‡ | 17.7 (355) | 3.8 (3) | 28.2 (73) | 12.0 (14) | 7.4 (10) | 15.5 (129) | 21.7 (126) | 2.8 | (–5.0 to 11.3) |
| Place of residence | |||||||||
| Iquitos city | 16.7 (877)‖ | 5.1 (11) | 26.6 (177)‖ | 7.9 (27)§ | 3.1 (16) | 16.1 (350)‖ | 22.2 (296)‖ | 6.4§ | (1.1–12.0) |
| Outside Iquitos city | 6.7 (83) | 8.9 (4) | 2.5 (1) | 1.7 (2) | 5.0 (2.3) | 8.6 (28) | 8.6 (43) | 29.1§ | (3.4–61.2) |
CI = confidence intervals.
*
Periods: 1993, Oct. 93–Sept. 94; 1994, Oct. 94–Sept. 95; 1995, Oct. 95–Sept. 96; 1996, Oct. 96–Sept. 97; 1997, Oct. 97–Sept. 98; 1998, Oct. 98–Sept. 99.
†
% Average annual change controlled for all demographic variables in the multiple logistic regression model.
‡
Others (workers, merchants, employees, independents, teachers, retired, unemployed).
§
P < 0.05
‖
P < 0.001