Clinical comparison of Chlamydia pneumoniae-seropositive and C. pneumoniae-seronegative patients
| Seropositive | Seronegative | p‐value | Seropositivity odds ratio (95% CI)# | |
| Male sex | 221 (54.7) | 60 (44.4) | 0.039 | |
| Age yrs | 63.1±17.8 | 61.9±20.0 | ns | |
| Body mass index | 26.0±6.4 | 23.4±4.9 | 0.000 | 1.09 (1.04–1.15) |
| Race | ||||
| White | 362 (89.6) | 128 (94.8) | 0.07 | |
| Non-White | 42 (10.3) | 7 (5.2) | 2.91 (1.04–8.12) | |
| Smoking status | ||||
| Never smoker | 78 (19.5) | 44 (33.1) | ||
| Past smoker | 193 (48.4) | 55 (41.4) | ||
| Current smoker | 128 (32.1) | 34 (25.6) | 0.005 | 2.24 (1.18–4.24) |
| COPD | 142 (35.1) | 30 (22.2) | 0.02 | |
| Systolic BP mmHg | 133.1±27.1 | 126.8±29.1 | 0.024 | |
| Diastolic BP mmHg | 73.6±15.1 | 70.6±13.8 | 0.045 |
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