Correction to: BMC Oral Health (2020) 20:104 https://doi.org/10.1186/s12903-020-01098-3

Following publication of the original article [1], the authors identified an error in the Table 4.

The correct table is given below:

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

Furthermore, due to those errors in Table 4, following corrections are related to the text:

  1. 1.

    Statistical analysis on page 3, paragraph 4: ‘RBL and PD are presented as percent and proportions (SE) of affected sites and teeth for the total study population, stratified by age group and ethnicity. Differences between groups were assessed with χ2-test and t-test;

  2. 2.

    Results on page 4 under subtitle ‘Prevalence and distribution’, last sentence: ‘In total (18–75 years), a higher proportion of Sámi had one or more PD ≥ 6 mm compared to non-Sámi (p < 0.05.);

  3. 3.

    Discussion on page 5, third paragraph, second sentence: ‘A larger proportion of Sámi had one or more PD ≥ 6 mm compared to non-Sámi, with no ethnic difference in prevalence of PD ≥ 4 mm and PD ≥ 6 mm’;

  4. 4.

    Abstract on page 1 under results, last sentence: ‘A higher proportion of Sámi had one or more PD ≥ 6 mm than the non-Sámi (p < 0.05)’;

Abstract on page 1 under conclusion: ‘People with Sámi ethnicity had deep periodontal pockets and an increased odds of having severe stages of periodontitis.

The original article has been updated.