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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