Table 2

Clinical comparison of Chlamydia pneumoniae-seropositive and C. pneumoniae-seronegative patients

SeropositiveSeronegativep‐valueSeropositivity odds ratio (95% CI)#
Male sex221 (54.7)60 (44.4)0.039
Age yrs63.1±17.861.9±20.0ns
Body mass index26.0±6.423.4±4.90.0001.09 (1.04–1.15)
 White362 (89.6)128 (94.8)0.07
 Non-White42 (10.3)7 (5.2)2.91 (1.04–8.12)
Smoking status
 Never smoker78 (19.5)44 (33.1)
 Past smoker193 (48.4)55 (41.4)
 Current smoker128 (32.1)34 (25.6)0.0052.24 (1.18–4.24)
COPD142 (35.1)30 (22.2)0.02
Systolic BP mmHg133.1±27.1126.8±29.10.024
Diastolic BP mmHg73.6±15.170.6±13.80.045
  • Data are presented as n (%) or mean±sd

  • CI: confidence interval

  • COPD: chronic obstructive pulmonary disease

  • BP: blood pressure

  • ns: nonsignificant

  • #: logistic model included the following patient variables: sex, age, highest level of education achieved, body mass index, race (White versus non-White), admission (from home versus other), drinking status (nondrinker versus drinker), smoking status (never, past and current), history of underlying respiratory disease (no versus yes), history of predisposing medical factors (no versus yes) and time of immunoglobulin G screening (winter versus nonwinter months). Patients who had “never smoked” were used as the reference category for smoking status