Table 4 Mean Bleeding on Probing (BoP) and Plaque Index (PI) (%) (presented as mean, standard deviation and 95% CI for mean), stratified by periodontitis severity and age group.

From: Study of Periodontal Health in Almada-Seixal (SoPHiAS): a cross-sectional study in the Lisbon Metropolitan Area

Measures

18–30

31–40

41–50

51–60

61–70

71–80

>80

rho* (p-value)

Total

Mean (SD) [95% CI]

Mean (SD) [95% CI]

Mean (SD) [95% CI]

Mean (SD) [95% CI]

Mean (SD) [95% CI]

Mean (SD) [95% CI]

Mean (SD) [95% CI]

Mean (SD) [95% CI]

Mean BoP (%)

13.6 (17.1)

[9.3–18.9]

12.5 (16.8)

[8.7–16.4]

15.1 (20.0)

[11.7–18.5]

15.7 (22.5)

[11.9–19.5]

15.2 (21.3)

[12.9–17.5]

14.9 (20.9)

[12.2–17.5]

14.3 (20.1)

[9.9–18.8]

−0.021 (0.502)

14.8 (20.6)

[13.6.16.1]

No Periodontitis

8.3 (9.8)

[5.6–11.1]

5.6 (8.3)

[3.2–8.0]

5.4 (9.6)

[3.1–7.6]

2.9 (4.5)

[1.7–4.1]

6.1 (10.8)

[4.0–8.1]

5.5 (8.3)

[3.6–7.5]

5.8 (13.5)

[–1.2-12.7]

−0.096 (0.048)

5.7 (9.3)

[4.8–6.5]

Non-severe Periodontitis

38.1 (22.4)

[23.1–53.1]

23.5 (19.7)

[14.5–32.5]

20.2 (16.8)

[15.1–25.3]

17.8 (17.9)

[12.6–23.1]

13.5 (18.8)

[10.1–16.8]

13.8 (20.9)

[9.6–18.1]

11.3 (17.5)

[5.5–17.0]

−0.287 (<0.001)

15.9 (19.6)

[13.9–17.9]

Severe Periodontitis

—

34.2 (25.0)

[3.1–65.3]

40.5 (28.5)

[26.8–54.3]

33.1 (31.4)

[22.3–43.9]

27.9 (26.7)

[22.4–33.4]

25.4 (24.8)

[19.7–31.1]

24.0 (23.5)

[14.7–33.3]

0.127 (0.043)

28.5 (26.8)

[25.2–31.9]

Total Periodontitis

38.1 (22.4)

[23.1–53.1]

25.6 (20.7)

[17.2–33.9]

26.3 (22.8)

[20.6–32.1]

24.3 (25.5)

[18.7–30.0]

19.6 (23.6)

[16.5–22.8]

18.9 (23.4)

[15.4–22.5]

16.6 (13.5)

[11.4–21.8]

−0.181 (<0.001)

21.0 (23.5)

[19.1–22.8]

Mean PI (%)

11.0 (15.9)

[7.0–15.0]

10.6 (21.0)

[5.7–15.4]

11.4 (19.8)

[8.1–14.8]

20.3 (24.4)

[15.3–25.3]

23.7 (29.9)

[20.4–26.9]

31.1 (32.9)

[27.0–35.3]

42.6 (37.6)

[34.3–50.8]

0.296 (<0.001)

23.2 (30.3)

[21.4–25.0]

No Periodontitis

9.5 (14.8)

[5.4–13.7]

7.3 (15.0)

[3.0–11.6]

6.4 (14.2)

[3.0–9.7]

7.7 (13.9)

[3.9–11.4]

13.6 (22.7)

[9.3–17.9]

20.9 (26.2)

[14.9–27.0]

29.3 (36.7)

[10.4–48.2]

0.220 (<0.001)

12.3 (21.1)

[10.3–14.3]

Non-severe Periodontitis

17.9 (20.0)

[4.5–31.3]

17.7 (31.3)

[3.4–32.0]

16.4 (23.1)

[9.3–23.4]

17.0 (22.5)

[10.4–23.5]

24.2 (29.1)

[19.1–29.3]

33.5 (34.8)

[26.4–40.5]

42.1 (38.0)

[29.6–54.6]

0.231 (<0.001)

26.0 (31.1)

[22.8–29.1]

Severe Periodontitis

—

12.7 (13.8)

[−4.4–29.7]

19.3 (25.2)

[7.2–31.5]

44.7 (39.8)

[31.0–58.4]

34.6 (34.2)

[27.6–41.6]

38.2 (34.2)

[30.3–46.0]

51.7 (36.1)

[37.4–65.9]

0.191 (0.002)

37.3 (35.1)

[33.0–41.6]

Total Periodontitis

17.9 (20.0)

[4.5–31.3]

16.7 (28.6)

[5.2–28.3]

17.3 (23.6)

[11.4–23.2]

28.8 (33.8)

[21.4–36.2]

28.7 (31.7)

[24.4–32.9]

35.5 (34.5)

[30.3–40.8]

46.1 (37.3)

[36.8–55.3]

0.231 (<0.001)

30.5 (33.2)

[27.9–33.1]

  1. BoP – Bleeding on Probing, PI – Plaque Index, SD – Standard Deviation.
  2. *Overall trend across age groups assessed by Spearman’s rank correlation coefficient (rho). Significant correlations identified in bold (p < 0.05).
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