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Table 1 Univariate negative binomial regression (NBR) models for the BD incidence rates by month with incidence rate ratio (IRR) and 95% confidence interval (CI)

From: Seasonal and geographical distribution of bacillary dysentery (shigellosis) and associated climate risk factors in Kon Tum Province in Vietnam from 1999 to 2013

Month Northwest Northeast Red River Delta North Central Coast South Central Coast Central Highlands Southeast Mekong River Delta
January Reference: 1 Reference: 1 Reference: 1 Reference: 1 Reference: 1 Reference: 1 Reference: 1 Reference: 1
February 1.14 (0.57–2.27) 1.27 (0.70–2.31) 1.32 (0.81–2.16) 1.29 (1.02–1.62)* 1.11 (0.88–1.41) 1.22 (0.93–1.61) 1.06 (0.76–1.48) 0.95 (0.76–1.21)
March 1.82 (0.92–3.63) 1.16 (0.64–2.11) 1.26 (0.77–2.06) 1.47 (1.17–1.85)* 1.20 (0.95–1.51) 1.66 (1.26–2.17)* 1.45 (1.04–2.02)* 0.93 (0.74–1.18)
April 2.35 (1.18–4.66)* 1.33 (0.73–2.42) 1.11 (0.68–1.82) 1.56 (1.24–1.96)* 1.27 (1.00–1.61)* 2.06 (1.56–2.71)* 1.37 (0.98–1.90) 0.94 (0.74–1.18)
May 2.83 (1.43–5.62)* 1.62 (0.89–2.94) 1.09 (0.67–1.79) 1.59 (1.26–1.99)* 1.28 (1.01–1.62)* 1.66 (1.26–2.19)* 1.52 (1.09–2.12)* 1.02 (0.80–1.28)
June 2.96 (1.49–5.88)* 1.55 (0.85–2.83) 1.29 (0.79–2.11) 1.63 (1.30–2.05)* 1.32 (1.05–1.67)* 1.84 (1.39–2.41)* 1.70 (1.22–2.37)* 1.08 (0.85–1.36)
July 2.90 (1.46–5.77)* 1.56 (0.86–2.84) 1.48 (0.91–2.42) 1.52 (1.20–1.91)* 1.33 (1.06–1.69)* 1.78 (1.36–2.34)* 1.73 (1.24–2.41)* 1.09 (0.86–1.38)
August 2.33 (1.17–4.63)* 1.88 (1.03–3.42)* 1.46 (0.90–2.39) 1.46 (1.16–1.83)* 1.24 (0.98–1.57) 1.42 (1.08–1.86)* 1.32 (0.95–1.84) 0.93 (0.73–1.17)
September 2.34 (1.18–4.64)* 1.27 (0.70–2.31) 1.27 (0.78–2.08) 1.48 (1.17–1.86)* 1.32 (1.04–1.67)* 1.25 (0.95–1.64) 1.25 (0.90–1.74) 0.91 (0.72–1.15)
October 1.56 (0.78–3.10) 1.05 (0.58–1.92) 1.31 (0.80–2.14) 1.41 (1.12–1.78)* 1.21 (0.96–1.54) 1.18 (0.90–1.56) 1.35 (0.97–1.88) 0.82 (0.65–1.04)
November 1.70 (0.85–3.38) 1.11 (0.61–2.02) 1.20 (0.74–1.96) 1.41 (1.12–1.78)* 1.18 (0.93–1.49) 1.24 (0.94–1.64) 1.14 (0.82–1.58) 0.84 (0.67–1.06)
December 1.95 (0.98–3.88) 1.26 (0.69–2.30) 1.04 (0.63–1.70) 1.34 (1.07–1.69)* 1.08 (0.85–1.37) 1.10 (0.84–1.45) 1.33 (0.95–1.84) 0.87 (0.69–1.10)
  1. *statistically significant at P < 0.05