Table 3.

Negative binomial regression analysis predicting operator’s adherent to guidelines (overall guideline adherence score) (N = 384)

			95 % confidence interval
Variable	B	Std. error	Lower bound	Upper bound	Exp(B)	P-value
(Intercept)	2.899	0.054	2.795	3.006	18.163	<0.001*
Training grade of the operators
Post-graduate Training Year III	−0.311	0.153	−0.608	−0.004	0.733	0.042*
Post-graduate Training Year II	0.208	0.762	0.058	0.358	1.232	0.006*
Post-graduate Training Year I	0.456	0.102	0.257	0.660	1.578	<0.001*
Junior Hospital Dental Officer	0	–	–	–	1	–
(Negative binomial)	0.192	0.024	0.151	0.245

$\mathcal{X}$ ² (3) = 29.48, P < 0.001*

*statistically significant (P ≤ 0.05)