Table 1 Population adjusted negative binomial regression model for diarrhoeal disease with dehydration cases in primary health care facilities in Cape Town, South Africa

Mean max temperature

1.074 (1.045–1.103)

 < 0.001

1.107 (1.080–1.135)

 < 0.001

Mean precipitation

0.963 (0.893–1.038)

0.31

1.029 (0.949–1.117)

0.47

Mean 8:00 relative humidity

1.026 (1.017–1.035)

 < 0.001

1.016 (1.007–1.025)

 < 0.001

Subdistrict

Eastern

Ref

Ref

Ref

Ref

Khayelitsha

1.893 (1.579–2.269)

 < 0.001

1.854 (1.554–2.211)

 < 0.001

Klipfontein

1.328 (1.097–1.608)

0.003

1.382 (1.147–1.665)

 < 0.001

Mitchell’s Plain

1.049 (0.868–1.268)

0.61

1.140 (0.948–1.372)

0.16

Northern

1.745 (1.437–2.118)

 < 0.001

1.824 (1.515–2.197)

 < 0.001

Southern

1.290 (1.055–1.577)

0.012

1.570 (1.269–1.943)

 < 0.001

Tygerberg

1.103 (0.913–1.333)

0.30

1.164 (0.968–1.400)

0.10

Western

1.159 (0.961–1.398)

0.12

1.224 (1.020–1.469)

0.027

Annual trend

2010

Ref

Ref

Ref

Ref

2011

1.093 (0.879–1.359)

0.41

0.938 (0.747–1.177)

0.57

2012

0.807 (0.649–1.004)

0.049

0.775 (0.618–0.972)

0.024

2013

0.896 (0.718–1.119)

0.32

0.750 (0.593–0.949)

0.014

2014

0.887 (0.713–1.104)

0.27

0.732(0.581–0.923)

0.007

2015

0.720 (0.577–0.897)

0.0028

0.678 (0.540–0.851)

 < 0.001

2016

0.731 (0.586–0.913)

0.0047

0.658 (0.524–0.827)

 < 0.001

2017

0.624 (0.500–0.780)

 < 0.001

0.557 (0.443–0.701)

 < 0.001

2018

0.462 (0.370–0.577)

 < 0.001

0.412 (0.327–0.519)

 < 0.001

2019

0.353 (0.275–0.452)

 < 0.001

0.318 (0.247–0.410)

 < 0.001