Table 2.

Patient characteristics.

CHARACTERISTIC	HIGH-RISK PATIENTS	MODERATE-RISK PATIENTS	LOW- OR UNKNOWN-RISK PATIENTS	ALL PATIENTS
Patients, No.	80	40	40	160
Female Sex, %	37.5	47.5	60	45.6
Age, y
Mean (SD*)	65.1 (13.4)†	60.1 (15.11)	46.9 (15.0)†	59.3 (16.0)
Median (IQR‡)	67.0 (59.0–76.0)	60.0 (49.0–71.0)	49.0 (32.0–58.0)	61.0 (49.0–70.0)
Study Duration for Each Patient, d
Mean (SD)	1,104 (473)	1,199 (337)	1,015 (437)	1,105 (436)
Median (IQR)	1,173 (696–1,394)	1,255 (932–1,451)	1,078 (703–1,361)	1,196 (830–1,392)
Total Dental Visits/Patient Studied, No.
Mean (SD)	9.8 (5.3)	10.1 (4.1)	9.4 (5.7)	9.8 (5.1)
Median (IQR)	10 (6–13)	10 (8–13)	9 (5–12)	9 (6–13)
Red§ Dental Visits/Patient, No.
Mean (SD)	5.8 (3.0)	7.3 (2.6)	5.8 (3.0)	6.2 (3.5)
Median (IQR)	6 (4–8)	7 (5–9)	6 (3–8)	6 (4–8)
Yellow¶ Dental Visits/Patient, No.
Mean (SD)	1.7 (2.1)	1.5 (1.5)	1.6 (1.5)	1.6 (1.8)
Median (IQR)	1 (0–2)	1 (0–3)	1 (0–2)	1 (0–2)
Green# Dental Visits/Patient, No.
Mean (SD)	2.3(2.4)	1.4 (1.9)	1.6 (2.0)	1.9 (2.2)
Median (IQR)	2 (0–3)	1 (0–2)	1 (0–2)	1 (0–3)

^*SD: Standard deviation.

^†Significantly different from the mean for all cases (P < .05).

^‡IQR: Interquartile range.

^§Invasive procedures that “should” be covered with antibiotic prophylaxis for those at high risk of developing infective endocarditis complications.

^¶Invasive dental procedures that “may” be covered with antibiotic prophylaxis on some occasions and not on others.

^#Noninvasive dental procedures for which there is no recommendation for antibiotic prophylaxis cover.