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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 km

27 to 48 km

49 to 102 km

>  102 km

Total

Year

IRR (IC 95%)

IRR (IC 95%)

IRR (IC 95%)

IRR (IC 95%)

IRR (IC 95%)

1999

1

1

1

1

1

2000

0.8 [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]

2001

1.0 [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]

2002

2.6 [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]

2003

1.5 [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]

2004

1.4 [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]

2005

1.6 [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]

2006

1.6 [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]

2007

2.2 [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]

2008

4.0 [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]

2009

2.5 [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]

2010

0.9 [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]