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Table 2 Incidence Rate Ratios (IRR) and 95% confidence intervals of acute respiratory symptoms (ARS) for each year (reference = 1999) for all health facilities and according to their distance to Nyiragongo. Values of IRR in bold reflect significant increases compared to 1999

From: Respiratory health and eruptions of the Nyiragongo and Nyamulagira volcanoes in the Democratic Republic of Congo: a time-series analysis

 ≤ 26 km27 to 48 km49 to 102 km>  102 kmTotal
YearIRR (IC 95%)IRR (IC 95%)IRR (IC 95%)IRR (IC 95%)IRR (IC 95%)
199911111
20000.8 [0.6–1.2]1.2 [0.9–1.5]0.8 [0.6–1.0]0.8 [0.7–1.1]0.9 [0.8–1.1]
20011.0 [0.6–1.6]1.8 [1.4–2.4]0.9 [0.6–1.4]0.8 [0.6–1.0]1.1 [0.9–1.4]
20022.6 [1.2–5.6]2.3 [1.8–3.0]1.0 [0.7–1.5]1.5 [0.9–2.5]1.8 [1.4–2.4]
20031.5 [0.7–3.1]2.1 [1.5–2.9]1.0 [0.8–1.4]1.6 [1.2–2.2]1.5 [1.2–1.9]
20041.4 [0.7–2.8]2.2 [1.6–3.0]1.3 [1.0–1.7]2.1 [1.0–4.4]1.7 [1.3–2.3]
20051.6 [0.8–3.2]1.5 [1.0–2.2]1.5 [1.0–2.4]2.4 [1.5–3.6]1.7 [1.4–2.2]
20061.6 [0.8–3.1]1.5 [1.1–2.0]1.6 [1.1–2.3]4.2 [2.5–7.1]2.2 [1.6–3.0]
20072.2 [1.1–4.4]1.6 [1.2–2.0]2.0 [1.2–3.2]3.7 [2.5–5.4]2.3 [1.8–3.0]
20084.0 [1.5–11.0]2.5 [1.7–3.6]2.1 [1.3–3.5]2.2 [1.7–2.9]2.7 [1.8–3.9]
20092.5 [1.0–6.3]2.8 [1.9–4.2]3.9 [2.5–5.9]1.9 [1.4–2.5]2.8 [2.2–3.7]
20100.9 [0.4–2.0]2.4 [1.5–3.7]3.8 [2.4–6.0]2.3 [1.7–3.0]2.4 [1.8–3.3]