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Table 1 Characteristics of study participants stratified by ethnic affiliation

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

  Total
n (%)
Sámi
n (%)
Non-Sámi
n (%)
P value* Internal loss
n (%)
Participants 2078 (100%) 1381 (66.5) 697 (33.5)   
Age     < 0.001 0 (0)
 18–34 419 (20.1) 313 (22.7)a 106 (15.2)b   
 35–49 687 (33.1) 435 (31.5)a 252 (36.2)b   
 50–64 709 (34.1) 468 (33.9) 241 (34.6)   
 65–75 263 (12.7) 165 (11.9) 98 (14.1)   
Sex     0.155 0 (0)
 Men 894 (43.0) 579 (41.9) 315 (45.2)   
 Women 1184 (57.0) 802 (58.1) 382 (54.8)   
Household income     0.035 104 (5.0)
  < 300,000 276 (14.0) 184 (13.3) 92 (13.2)   
 300,001-600,000 792 (40.1) 547 (39.6) a 245 (35.2)b   
 600,001-900,000 615 (31.2) 400 (29.0) 215 (30.9)   
  > 900,001 291 (14.7) 174 (12.6) a 117 (16.8)b   
Education     < 0.001 69 (3.3)
 1–9 years 242 (12.0) 178 (13.4) a 64 (9.3)b   
 10–13 years 781 (38.9) 462 (34.9) a 319 (46.6)b   
  ≥ 14 years 986 (49.1) 684 (51.7)a 302 (44.1)b   
Smoking     0.198 28 (1.3)
 Yes 443 (21.3) 283 (20.5) 160 (23.0)   
 No 1607 (77.3) 1079 (78.1) 528 (75.8)   
Toothbrushing frequency     < 0.001 3 (0.1)
  < 1 time/day 175 (8.4) 142 (10.3) a 33 (4.7)b   
 1 time/day 631 (30.4) 462 (33.5) a 169 (24.3)b   
  ≥ 2 times/day 1269 (61.2) 775 (56.1) a 494 (70.9)b   
Dental attendance     0.004 20 (1.0)
 Yearly 1150 (55.3) 729 (52.8) a 421 (60.4)b   
 Every other year 721 (34.7) 501 (36.3) a 220 (31.6)b   
 Seldom 187 (9.0) 136 (9.9) 51 (7.3)   
  1. *P-value for differences between groups using the χ2 test. When numbers in columns do not equal n or 100%, there is an internal drop out in background data. Different superscript letters denotes significant differences in periodontitis prevalence between characteristics (row proportions) at the 0.05 level