Table 2 Primary RD surgery failure model estimates.

From: Stratifying the risk of re-detachment: variables associated with outcome of vitrectomy for rhegmatogenous retinal detachment in a large UK cohort study

Covariate

Odds ratio

Coefficient

p-value

95% CI for the odds ratio

Constant

0.120

−1.611

<0.001

0.088 to 0.452

Patient age (years)

 45 to 64

Ref

Ref

N/A

N/A

 65 to 79

1.266

0.236

0.005

1.076 to 1.490

 ≥80

1.645

0.498

0.001

1.221 to 2.218

 <45

1.583

0.459

0.004

1.154 to 2.171

Location of lowest break

 9–3 O’clock

Ref

Ref

N/A

N/A

 4 or 8 O’clock

1.533

0.428

0.002

1.171 to 2.008

 5–7 O’clock

1.835

0.607

<0.001

1.505 to 2.237

 No break found

1.966

0.676

0.242

0.634 to 6.100

Inferior clock hours detached

 <3 h

Ref

Ref

N/A

N/A

 3 to 5 h

1.554

0.441

<0.001

1.259 to 1.918

 6 h

1.545

0.435

0.005

1.143 to 2.089

Total RD

 No

Ref

Ref

N/A

N/A

 Yes

1.941

0.663

<0.001

1.411 to 2.668

PVR grade

 None, A or B

Ref

Ref

N/A

N/A

 C

1.247

0.220

<0.001

1.133 to 1.372

Cryotherapy used during surgery

 No

Ref

Ref

Ref

Ref

 Yes

0.657

−0.420

0.011

0.476 to 0.908

Tamponade used during surgery

 Sulphur hexafluoride gas

Ref

Ref

Ref

Ref

 Perfluoroethane gas

0.659

−0.417

0.006

0.490 to 0.887

 Perfluoropropane gas

0.901

−0.104

0.473

0.678 to 1.198

 Air

0.853

−0.159

0.752

0.319 to 2.284

 Light oil

1.954

0.670

<0.001

1.361 to 2.805

 Heavy oil

1.031

0.030

0.931

0.522 to 2.037

Vitrectomy gauge used

 20 g

Ref

Ref

Ref

Ref

 23 g

0.665

−0.408

0.258

0.327 to 1.349

 25 g

0.413

−0.885

0.014

0.204 to 0.834

 27 g

0.495

−0.703

0.132

0.198 to 1.127

 Not recorded

0.478

−0.738

0.123

0.187 to 1.223

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