Table 4.

Association between dental procedures and oral streptococcal infective endocarditis in case crossover study, 2008-14

Dental procedures	Odds ratio (95% CI)	P value
Non-exposure	1.00
Dental procedures model
Invasive dental procedures	1.66* (1.05 to 2.63)	0.03
Non-invasive dental procedures	0.98* (0.70 to 1.36)	0.16
Antibiotic prophylaxis dental procedures model
Invasive dental procedures:
Without antibiotic prophylaxis	1.62 (0.81 to 3.27)	0.32
With antibiotic prophylaxis	1.69 (0.93 to 3.06)	0.19
Non-invasive procedures:
Without antibiotic prophylaxis	0.99 (0.69 to 1.42)	0.29
With antibiotic prophylaxis	0.92 (0.44 to 1.91)	0.39

*Interaction test between invasive and non-invasive dental procedures z score=1.80 (0.527/0.292; P=0.07).