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Table 2 Negative binomial regression model of meteorological factors associated with the incidence of Varicella in Jinan, China, 2012–2014

From: Association between the incidence of varicella and meteorological conditions in Jinan, Eastern China, 2012–2014

  β Std. error P (eβ − 1)a100 = percent increase 95 % CI for percent increase (%)
Lower boundary Upper boundary
(A)       
(Intercept) −95.1950 26.8756 0.0000 - - -
Year 0.0490 0.0134 0.0000 5.0220 2.3267 7.8963
Wind velocity 0.0310 0.0216 0.1490 3.1486 −1.0940 7.6807
Average temperature −0.0350 0.0014 0.0000 −3.4395 −3.7287 −3.1493
Relative humidity −0.0040 0.0013 0.0010 −0.3992 −0.6976 −0.1998
Sunshine 0.0100 0.0012 0.0000 1.0050 0.8032 1.3085
Rainfall 0.0020 0.0007 0.0000 0.2002 0.1001 0.4008
(B)       
(Intercept) −59.6100 26.4741 0.0240 - - -
Year 0.0150 0.0131 0.2580 1.5113 −1.0940 4.1852
Wind velocity 0.0650 0.0221 0.0030 6.7159 2.2244 11.5162
Atmospheric pressure 0.0340 0.0019 0.0000 3.4585 3.0455 3.8731
Relative humidity −0.0080 0.0013 0.0000 −0.7968 −1.0940 −0.5982
Sunshine 0.0040 0.0012 0.0000 0.4008 0.2002 0.7025
Rainfall 0.0030 0.0007 0.0000 0.3005 0.1001 0.4008
(C)       
(Intercept) −96.5730 26.8547 0.0000 - - -
Year 0.0500 0.0133 0.0000 5.1271 2.4290 7.8963
Average temperature −0.0350 0.0014 0.0000 −3.4395 −3.7287 −3.1493
Relative humidity −0.0050 0.0012 0.0000 −0.4988 −0.6976 −0.2996
Sunshine 0.0110 0.0012 0.0000 1.1061 0.8032 1.3085
Rainfall 0.0020 0.0007 0.0000 0.2002 0.1001 0.4008
(D)       
(Intercept) −62.3230 26.4431 0.0180 - - -
Year 0.0170 0.0131 0.1930 1.7145 −0.8960 4.3938
Atmospheric pressure 0.0330 0.0018 0.0000 3.3551 2.9425 3.6656
Relative humidity −0.0100 0.0012 0.0000 −0.9950 −1.1928 −0.7968
Sunshine 0.0050 0.0011 0.0000 0.5013 0.2002 0.7025
Rainfall 0.0030 0.0007 0.0000 0.3005 0.1001 0.4008
  1. a(A) and (C) were respectively preliminary and final models without atmospheric pressure. (B) and (D) were respectively preliminary and final models without average temperature
  2. bCI, Confidence interval, a type of interval estimate of a population parameter