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Table 4 Prevalence and extent of radiographic bone loss and periodontal pocked depth by age group, ethnicity and in total

From: Periodontal health in an indigenous Sámi population in Northern Norway: a cross-sectional study

Periodontal measurements Age Groups (years) Total
18–34 35–49 50–64 65–75 18–75
Ethnicity Sámi Non-Sámi Sámi Non-Sámi Sámi Non-Sámi Sámi Non-Sámi Sámi Non-Sámi
Number of individuals 313 106 435 252 468 241 165 98 1381 697
RBL, proportionsa
  RBL 15–33% 3.8 5.7 32.6 25.0 59.4 53.5 53.9 57.1 37.7 36.4
  RBL > 33% 0.3 0.0 3.5 5.6 23.3 21.2 25.5 25.5 12.1 12.9
PD, proportionsa
  One or more PD ≥ 4 mm 40.6 40.6 63.7 56.4 71.6 63.1 73.3 81.6 62.3 59.8
  One or more PD ≥ 6 mm 5.1 5.7 16.1 10.3b 29.1 19.9 27.3 27.5 19.4 15.6
PD, mean (SE)b
Proportions of sites/mouth
  PD ≥ 4 mm 3.5 (0.4) 3.8 (0.7) 7.7 (0.5) 6.8 (0.7) 10.5 (0.7) 10.1 (1.0) 8.8 (0.9) 11.7 (1.4) 8.0 (0.3) 8.2 (0.5)
  PD ≥ 6 mm 0.2 (0.0) 0.1 (0.1) 0.5 (0.1) 0.4 (0.1) 1.3 (0.2) 1.1 (0.2) 1.2 (0.2) 1.2 (0.3) 0.8 (0.1) 0.7 (0.1)
  1. RBL = radiographic bone loss; PD = periodontal pocket depth. SE = standard error. Bold-face = statistically significant differences between Sámi and non-Sámi in each age group p < 0.05
  2. Statistical analyses were done with a= χ2-test and b= independent t-test