Table 4 Factors associated with number of patients recruited in the project by dentists and dental hygienists (n = 37). Estimates of incidence rate ratios (IRRs) with 95 % CI obtained from the zero-inflated Poisson regression model

Clinical experience (ref: ≤9 years)

≥ 10 years

0.96 (0.75, 1.23)

0.74

First time involvement in research projects (ref: Yes)

No

1.23 (0.97, 1.57)

0.09

1.75 (1.29, 2.38)

< 0.01

Clinic size (ref: Small)

Large

0.88 (0.69, 1.11)

0.27

Position (ref: Part time)

Full time

1.20 (0.92, 1.56)

0.18

Knowledge

1.21 (0.98, 1.48)

0.07

1.47 (1.03, 2.08)

0.04

Skills

1.86 (1.52, 2.27)

< 0.01

1.20 (0.68, 2.08)

0.53

Professional role and identity

1.59 (1.31, 1.92)

< 0.01

1.23 (0.78, 1.94)

0.37

Beliefs about capabilities

1.82 (1.51, 2.20)

< 0.01

1.08 (0.78, 1.51)

0.64

Motivation

1.57 (1.24, 1.98)

< 0.01

1.56 (0.99, 2.44)

0.06

Beliefs about consequences

2.74 (2.16, 3.48)

< 0.01

2.46 (1.56, 3.88)

< 0.01

Intentions

1.39 (1.13, 1.72)

< 0.01

0.74 (0.50, 1.09)

0.13

Organizational resources

1.46 (1.24, 1.73)

< 0.01

1.53 (1.20, 1.95)

< 0.01

Environmental context

2.98 (2.46, 3.61)

< 0.01

3.00 (2.10, 4.29)

< 0.01

Social influence

1.04 (0.87, 1.25)

0.65