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Table 3 Univariable and multivariable negative binomial regression results

From: Author self-citation in orthodontics is associated with author origin and gender

  Univariable Multivariable
Journal IRR P value 95% CI IRR P value 95% CI
 AO 1.26 0.36 0.76, 2.09 Reference   
 AJODO 1.15 0.56 0.72, 1.85 1.10 0.46 0.85, 1.43
 OCR 1.10 0.76 0.58, 2.11 1.10 0.65 0.73, 1.67
 EJO 1.86 0.02 1.12, 3.10 1.18 0.25 0.89, 1.58
 PIOR 1.65 0.09 0.93, 2.91 1.17 0.35 0.84, 1.64
 KJO Reference    1.05 0.82 0.72, 1.53
Study type IRR P value 95% CI    
 RCT 0.73 0.26 0.42, 1.27    
 Prospective observational 0.79 0.31 0.51, 1.24    
 Retrospective observational 0.62 0.05 0.38, 1.00    
 Narrative or systematic review, meta-analysis 0.83 0.52 0.48, 1.45    
 Survey 0.61 0.27 0.25, 1.49    
 Case report Reference      
Topic IRR P value 95% CI    
 OHRQOL/esthetics/practice management/socio-demographics 1.79 0.20 0.74, 4.32    
 Biomaterials 1.15 0.36 0.60, 3.96    
 Diagnosis 1.67 0.25 0.70, 3.95    
 Treatment 1.77 0.19 0.76, 4.14    
 Growth 2.09 0.10 0.86, 5.07    
 New technologies 1.27 0.61 0.50, 3.20    
 Periodontics/caries prevention 1.53 0.42 0.55, 4.25    
 Side effects 1.23 0.68 0.46, 3.29    
 Other Reference      
Number of authors IRR P value 95% CI    
 1–3 1.17 0.34 0.85, 1.61    
 4–5 1.09 0.56 0.82, 1.45    
 > 5 Reference      
Rank IRR P value 95% CI    
 First 1.06 0.59 0.86, 1.32    
 Last Reference      
Origin IRR P value 95% CI IRR P value 95% CI
 Asia Reference    Reference   
 Europe 1.63 0.00 1.28, 2.08 1.62 < 0.001 1.25, 2.11
 North America 1.34 0.06 0.99, 1.82 1.34 0.06 0.99, 1.82
 South America 1.06 0.75 0.74, 1.53 1.15 0.46 0.79, 1.67
 Other/combination 1.41 0.02 1.05, 1.88 1.41 0.03 1.04, 1.90
Gender IRR P value 95% CI IRR P value 95% CI
 Female Reference    Reference   
 Male 1.31 0.01 1.06, 1.62 1.36 < 0.01 1.10, 1.68
  1. IRR incidence rate ratio
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