Table 2.  Association of the previous number of antibiotics boxes dispensed and the staphylococcal resistance. A multivariate logistic regression analysis model.
Variable  95% CI  OR  P value
Staphylococcus aureus resistance
 Age (years)  0.98–1.00  0.99  0.24
 Sex (women)  0.45–1.14  0.72  0.16
 Any antibioticsa  0.99–1.16  1.07  0.55
Penicillin-resistant Staphylococcus aureus
 Age (years)  0.99–1.01  1.00  0.76
 Sex (women)  0.46–1.01  0.70  0.11
 Penicillin packages (number)  1.04–1.35  1.18  0.01
Methicillin-resistant Staphylococcus aureus (MRSA)
 Age (years)  0.99–1.05  1.02  0.22
 Sex (women)  0.15–2.43  0.61  0.48
 Any antibioticsa  1.16–2.20  1.60  <0.01
aHave taken one or more antibiotic boxes.