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. 2021 Jan 5:aqaa268. doi: 10.1093/ajcp/aqaa268

Table 2.

Anti–SARS-CoV-2 Serology Results for All Participants

All PCR Positive Suspected P Value
IgG positive (%) 89/128 (69.5) 66/77 (85.7) 23/51 (45.1) < .0001a
IgM positive (%) 48/128 (37.5) 35/77 (45.5) 13/51 (25.5) .0224a
IgG RFU median (IQR) 144 (37.5- 448) 184 (89-599) 35 (7-238.5) < .0001b
 Minimum-maximum 5- 2,520 10-1,764 5-2,520
IgM RFU median (IQR) 38 (25.5- 71.25) 42 (28-84) 29.5 (18-50.5) .0024b
 Minimum-maximum 14-2,334 14-2,334 14-189

IQR, interquartile range; PCR, polymerase chain reaction; RFU, relative fluorescence units; SARS-CoV-2, severe acute respiratory syndrome coronavirus 2.

aBy χ 2 test for PCR positive vs suspected SARS-CoV-2 infection.

bBy Mann-Whitney test for PCR positive vs suspected SARS-CoV-2 infection.