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. 2019 Dec 6;9:18515. doi: 10.1038/s41598-019-55112-y

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Quadratic regression plot to compare the Xpert MTB/RIF results with culture and smear microscopy. On Xpert MTB/RIF axis, results are categorized as 0, 1, 2, 3 and 4 which are indicated as negative, very low, low, medium and high scales, respectively. On the smear axis, results are categorized as 0, 1, 2 and 3 which are indicated as negative, 1+, 2+ and 3+ grading, respectively. On culture axis, results are categorized as 0, 1, 2, 3 and 4 which are indicated as negative, 1+, 2+, 3+ and 4+ grading, respectively. Part “a” and “b” are representative for pulmonary specimens and part “c” and “d” are representative for extra-pulmonary specimens. Regression lines showed the correlations between Xpert MTB/RIF results and culture/direct smear methods results.