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Table 2 Negative binominal model for the number of mental health consultations

From: Effect of the time interval between cataract surgery for both eyes on mental health outcome: a cohort study of 585,422 patients

  IRR 95% CI p-value
First eye pre-surgery reference   
First eye post-surgery 0.978 0.971–0.985 < 0.001
Time interval between first and second eye
  < 3 months ref   
 3–6 months 1.021 1.002–1.041 0.027
 6–12 months 1.031 1.008–1.055 0.009
  > 12 months 0.939 0.923–0.955 < 0.001
Post-surgery*time interval
 Post/3-6 months 1.034 1.020–1.047 < 0.001
 Post/6–12 months 1.087 1.070–1.104 < 0.001
 Post/> 12 months 1.095 1.082–1.108 < 0.001
Age
 20–35 ref   
 35–50 1.595 1.211–2.099 0.001
 50–65 2.383 1.820–3.120 < 0.001
  > =65 2.870 2.192–3.756 < 0.001
Sex
 Male ref   
 Female 1.459 1.440–1.479 < 0.001
Urbanization
 Urban ref   
 Suburban 0.924 0.911–0.937 < 0.001
 Rural 0.787 0.771–0.803 < 0.001
Low-income status
 No ref   
 Yes 1.738 1.602–1.885 < 0.001
Charlson Comorbidity Index
 0 ref   
 1 1.221 1.180–1.264 < 0.001
  > =2 1.330 1.265–1.398 < 0.001
  1. CI confidence interval, IRR incidence rate ratio