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Table 2 Negative binomial regression analysis showing factors associated with increased duration of care home closure, November 2012–December 2016

From: How timely closure can reduce outbreak duration: gastroenteritis in care homes in North West England, 2012–2016

Variable

Univariable

Multivariable

IRR

95% confidence interval

P

IRR

95% confidence interval

P

Lower

Upper

Lower

Upper

Total size of home (quartile)

1st (smallest)

 

ref

 

ref

 

2nd

1.189

1.075

1.315

< 0.001

1.154

1.038

1.283

0.008

3rd

1.339

1.213

1.479

< 0.001

1.282

1.150

1.430

< 0.001

4th (largest)

1.374

1.244

1.517

< 0.001

1.426

1.275

1.595

< 0.001

Total attack rate

Under 20%

 

ref

 

ref

 

20 to 39.9%

1.464

1.366

1.570

< 0.001

1.391

1.290

1.500

< 0.001

40% and over

1.370

1.213

1.547

< 0.001

1.434

1.257

1.636

< 0.001

Winter outbreak

 

1.032

0.965

1.104

0.362

1.008

0.940

1.080

0.822

CQC overall rating

1.053

0.991

1.119

0.092

1.031

0.964

1.102

0.376

Residents with dementia

1.106

1.033

1.184

0.004

1.050

0.974

1.133

0.200

Ratio of residents to staff

0.914

0.846

0.986

0.023

0.977

0.895

1.068

0.613

Closure within 3 days

0.371

0.311

0.441

< 0.001

0.442

0.366

0.534

< 0.001

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