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Table 1 The association between monthly scrub typhus incidence and potential influencing factors by panel negative binomial regression

From: Rapid increase of scrub typhus incidence in Guangzhou, southern China, 2006―2014

Variables (unit)a

Univariate analysis

Multivariate analysis

Crude IRR (95% CI)

P-value

Adjusted IRR (95% CI)

P-value

AP (1 hPa)

0.87 (0.86, 0.87)

<0.001

0.89 (0.88, 0.90)

<0.001

Temperature (1 °C)

1.17 (1.16, 1.18)

<0.001

NS (excluded)

 

RH (10%)

1.11 (1.10, 1.12)

<0.001

1.04 (1.03, 1.05)

<0.001

Precipitation (1 mm)

1.002 (1.002, 1.002)

<0.001

NS (excluded)

 

WV (1 m/s)

0.26 (0.22, 0.30)

<0.001

NS (excluded)

 

ST (10%)

1.03 (1.03, 1.03)

<0.001

NS (excluded)

 

Croplands (10%)

0.97 (0.95, 0.99)

0.001

NS (excluded)

 

CV (10%)

0.98 (0.96, 0.99)

<0.001

NS (excluded)

 

BF (10%)

1.05 (1.04, 1.06)

<0.001

1.05 (1.03, 1.06)

<0.001

NF (10%)

1.06 (1.04, 1.08)

<0.001

NS (excluded)

 

MF (10%)

1.04 (1.02, 1.07)

0.001

NS (excluded)

 

GF (10%)

1.15 (1.03, 1.27)

0.012

NS (excluded)

 

Shrub (10%)

1.01 (1.01, 1.02)

<0.001

NS (excluded)

 

HV (10%)

0.96 (0.95, 0.97)

<0.001

NS (excluded)

 

AS (10%)

0.99 (0.99, 0.99)

<0.001

NS (excluded)

 

BL (10%)

0.89 (0.84, 0.93)

<0.001

NS (excluded)

 

WB (10%)

1.001 (0.997, 1.006)

0.538

-

 

Elevation (10 m)

1.09 (1.07, 1.11)

<0.001

NS (excluded)

 

FT

1.23 (1.02,1.48)

0.033

1.81 (1.43,2.29)

<0.001

  1. aAP, monthly average atmospheric pressure with 1-month lag; Temperature, monthly average temperature with 1-month lag; RH, monthly average relative humidity with 2-month lag; Precipitation, monthly aggregate precipitation with 2-month lag; WV, monthly average wind velocity with 1-month lag; ST, current monthly aggregate proportion of sunlight time; Croplands, percentage coverage of post-flooding or irrigated croplands (or aquatic) and rainfed croplands; CV, percentage coverage of mosaic cropland and vegetation (grassland/shrub/forest); BF, Percentage coverage of broadleaved forest; NF, percentage coverage of needle leaved forest; MF, percentage coverage of mixed broadleaved and needle leaved forest; GF, percentage coverage of mosaic grassland and forest or shrub; Shrub, percentage coverage of broadleaved or needle leaved, and evergreen or deciduous shrub; HV, percentage coverage of herbaceous vegetation (grassland, savannas or lichens/mosses); AS, percentage coverage of artificial surfaces and associated areas; BL, percentage coverage of bared land; WB, percentage coverage of water bodies; Elevation, mean elevation; FT, feature of township (rural vs. urban)