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["Table 4. Comparison of antibody detection between the chronic underlying disease group and the non-chronic underlying disease group"]
["Item1","CUD group \n(n = 538)","Non-CUD group  \n(n = 645)","Test value2","P-value"]
["IgG (+), IgM (+)","329 (61.15%)","405 (62.79%)",0.33,0.563]
["IgG (+), IgM (-)","37 (6.88%)","54 (8.37%)",0.92,0.337]
["IgG (-), IgM (+)","1 (0.19%)","2 (0.31%)",0.18,0.672]
["IgG (-), IgM (-)","80 (33.61%)","75 (11.63%)",5.57,0.018]
["IgG (nt)3, IgM (+)","31 (5.76%)","42 (6.51%)",0.29,0.594]
["IgG (nt), IgM (-)","18 (3.35%)","17 (2.64%)",0.52,0.473]
["IgG (nt), IgM (nt)","42 (7.81%)","50 (7.75%)",0.001,0.972]
["1Count data are presented as count and percentage. χ2 test was used for statistical test. \n2The χ2 value is shown in each item. \n3nt, antibody not tested."]

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