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. 2018 Feb 20;34(5):1154–1164. doi: 10.3904/kjim.2017.158

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Copyright © 2019 The Korean Association of Internal Medicine

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted noncommercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Figure 2. — Distribution of the hematological and immunological parameters according to the Pittsburgh Sleep Quality Index (PSQI) quartiles. The distribution of the (A) white blood cell (WBC) counts (p = 0.001 by the Kruskal-Wallis test) and (B) absolute neutrophil counts (ANC; p = 0.013) was significantly different among the PSQI quartiles, even though the difference in the (C) immunoglobulin G (IgG) levels (p = 0.154) was not significant. Additionally, a significant positive trend for the WBC counts or ANC and a negative trend for the IgG levels were found across the PSQI quartiles. (D) Eventually, the distribution of the EULAR SS Disease Activity Index (ESSDAI) was significantly different (p = 0.037) and a significant negative trend for the ESSDAI was observed across the PSQI quartiles. p values above the figures were calculated by the Jonckheere-Terpstra test. EULAR, European League Against Rheumatism; SS, Sjögren’s syndrome.