Table 3 Univariable and multivariable negative binomial regression results

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