Table 1: Frequency distribution of periodontal conditions (calculus and/or bleeding), according to independent variables. 12-year-old schoolchildren, Goiania, Brazil, 2010.

Presence of calculus and/or bleeding Total (%)
Yes % (CI 95%)No % (CI 95%)

Individual variables
 Sex0.121
  Female6.2 (4.3–8.9)93.8 (91.0–95.7)1,022 (49.1)
  Male7.7 (6.0–10.1)92.3 (89.9–94.0)1,053 (50.9)
 Color/race0.005*
  White4.8 (3.2–7.0)95.2 (92.9–96.8)787 (36.4)
  Black4.9 (2.1–10.9)95.1 (89.0–97.9)192 (8.8)
  Brown8.9 (6.9–11.3)91.1 (88.6–93.1) 1,089 (54.5)
 Mother’s level of schooling (years)0.117
  More than 115.6 (3.5–9.0)94.4 (90.1–96.5)427 (21.3)
  8 to 11 6.3 (5.1–7.9)93.7 (92.1–94.9)1,080 (51.2)
  Less than 89.3 (5.7–14.8)90.7 (85.2–94.2)568 (27.5)
Contextual variables
 Health district (group)0.337
  I4.7 (2.0–10.5)95.3 (89.5–97.9)425 (18.4)
  II6.6 (4.5–9.5)93.4 (90.5–95.5)745 (37.9)
  III8.3 (5.7–12.0)91.7 (87.9–94.3)905 (43.7)
 School toothbrushing program0.640
  Yes6.4 (4.0–10.1)93.6 (89.8–96.0)632 (30.5)
  No7.3 (5.2–10.2)92.7 (89.8–94.8)1,443 (69.50%)
 Type of school0.039*
  Private4.6 (2.9–7.2)95.4 (92.8–97.1)604 (28.8)
  Public8.0 (5.9–10.7)92.0 (89.3–94.0)1471 (71.2)

Total7.0 (5.3–9.2)93.0 (90.7–94.6)

*Rao-Scott test. .
95% CI: Confidence Interval at 95%.