Table 1

Demographic and clinical characteristics of patients included in this retrospective chart review*
Characteristics Confirmed Late (n=23) Probable Late (n=13) PLS (n=36) Other diagnosis (n=35) No specific diagnosis (n=128)
Demographics
Age at illness onset 49.1 (44.9-65.3) 56.6 (50-67) 46.6 (35.5-52.5) 55.4 (36.5-61.6) 42.2 (32.1-53.0)
Male Sex 14/23 (61%) 6/13 (46%) 19/36 (53%) 14/35 (40%) 43/128 (34%)
Illness duration (weeks) 52 (9-130) 63 (52-152) 127 (30-270) 52 (25-216) 78 (40-204)
Symptoms
Widespread musculoskeletal pain 2/23 (9%) 11/13 (85%) 36/36 (100%) 17/35 (49%) 112/128 (88%)
Fatigue 0/23 (0%) 8/13 (62%) 32/36 (89%) 15/35 (43%) 96/128 (75%)
Cognitive complaints 0/23 (0%) 6/13 (46%) 19/36 (53%) 8/35 (23%) 67/128 (52%)
Signs
Patient reported rash in absence of physician diagnosis of EM 1/23 (4%) 5/13 (38%) 1/36 (3%) 5/35 (14%) 33/128 (26%)
Physician documented EM 1/23 (4%) 0/13 (0%) 26/36 (72%) 4/35 (11%) 1/128 (1%)
Other physician documented objective findings 21/23 (91%) 0/13 (0%) 9/36 (25%) 2/35 (6%) 11/128 (9%)
Serology
% ELISA positive ( >.9) 17/18 (94%) 11/11 (100%) 18/28 (64%) 6/23 (26%) 6/104 (6%)
Median ELISA among those (+) 3.5 2.0 1.8 1.75 1.4
% IgM immunoblot (+) 14/22 (64%) 2/11 (18%) 14/31 (45%) 4/28 (14%) 32/109 (29%)
Treatment
Non-recommended antibiotic 8/23 (35%) 4/13 (31%) 14/36 (39%) 6/35 (17%) 43/128 (34%)
Steroid 3/23 (13%) 2/13 (15%) 9/36 (25%) 5/35 (14%) 19/128 (15%)

*no. (%) for dichotomous variables and median (IQR) for continuous variables.

Aucott et al.

Aucott et al. BMC Infectious Diseases 2012 12:173   doi:10.1186/1471-2334-12-173

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