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Table 2 Univariate negative binomial regression (NBR) models for the DF incidence rates by month with incidence rate ratio (IRR) and 95% confidence interval (CI)

From: Seasonal patterns of dengue fever and associated climate factors in 4 provinces in Vietnam from 1994 to 2013

Month Hanoi Khanh Hoa Ho Chi Minh City An Giang
January 2.73 (1.19-6.26)* 1.26 (0.73-2.18) 1.61 (1.03-2.53)* 2.12 (1.39-3.22)*†
February Reference: 1 Reference: 1 Reference: 1 Reference: 1
March 1.36 (0.59-3.14) 0.90 (0.52-1.56) 0.84 (0.54-1.32) 1.04 (0.68-1.59)
April 1.43 (0.62-3.30) 1.12 (0.65-1.92) 0.71 (0.45-1.11) 1.69 (1.11-2.56)*
May 5.14 (2.24-11.77)*† 1.34 (0.78-2.30)* 0.71 (0.45-0.11) 2.58 (1.70-3.92)*†
June 6.63 (2.90-15.19)*† 1.79 (1.04-3.09)* 0.99 (0.63-1.54) 3.28 (2.16-4.98)*†
July 14.94 (6.52-34.17)*† 2.55 (1.43-4.39)*† 1.40 (0.89-2.19) 3.58 (2.36-5.45)*†
August 22.02 (9.63-50.34)*† 2.46 (1.43-4.24)*† 2.06 (1.31-3.22)*† 4.57 (3.01-6.94)*†
September 38.47 (16.83-87.94)*† 2.35 (1.36-4.04)*† 1.91 (1.22-2.99)* 5.26 (3.46-8.00)*†
October 55.07 (23.65-123.59)*† 2.69 (1.56-4.63)*† 2.40 (1.53-3.76)*† 4.49 (2.95-6.83)*†
November 46.69 (20.43-106.73)*† 2.22 (1.29-3.83)*† 2.35 (1.50-3.67)*† 3.49 (2.30-5.31)*†
December 13.44 (5.88-30.74)*† 1.75 (1.02-3.01)* 1.84 (1.18-2.89)*† 3.01 (1.98-4.58)*†
  1. * = statistically significant (P < 0.05)
  2. † = Bonferroni adjustment (P < 0.05/11)