Table 4.
Changes of malaria mortality for a 1° increase in longitude and latitude, Yunnan Province, China, 1991–2010
| Time intervals | Longitude | Latitude | ||||
|---|---|---|---|---|---|---|
| OR | 95% CI | P value | OR | 95% CI | P value | |
| Period 1–Period 2 | 0.743 | 0.585–0.943 | 0.015* | 0.879 | 0.649–1.192 | 0.407 |
| Period 1–Period 3 | 0.617 | 0.464–0.820 | 0.001** | 0.861 | 0.613–1.207 | 0.385 |
| Period 1–Period 4 | 0.869 | 0.603–1.251 | 0.449 | 1.061 | 0.667–1.689 | 0.803 |
| Period 2–Period 3 | 0.639 | 0.489–0.833 | 0.001** | 0.799 | 0.576–1.108 | 0.178 |
| Period 2–Period 4 | 1.023 | 0.736–1.424 | 0.891 | 1.017 | 0.674–1.536 | 0.935 |
| Period 3–Period 4 | 1.309 | 0.788–2.175 | 0.299 | 1.229 | 0.719–2.100 | 0.451 |
OR = odds ratio; CI = confidence interval; *P < 0.05; **P < 0.01; Separate odds ratios reported for different intervals defined by the four periods. Period 1 = 1991–1995; Period 2 = 1996–2000; Period 3 = 2001–2005; Period 4 = 2006–2010.