Table 3

Results of multivariate linear regression model to measure the effect of resistance on number of days with any one symptom after adjusting for significant risk factors.

	% increase in number of days with any one symptom^a compared to those sensitive to all antibiotics

	Resistant to antibiotic prescribed		Sensitive to antibiotic prescribed
	P-value	Increase (95% CI)	P-value	Increase (95% CI)
Resistant to trimethoprim^b	<0.001	56 (25 to 94)	<0.001	70 (30 to 123)

Resistant to ampicillin^b	<0.001	72 (39 to 114)	0.669	−3 (−16 to 12)

Resistant to at least one antibiotic	0.001	60 (30 to 97)	0.943	1 (−13 to 16)

↵a Adjusted for sex, comorbidity, previous bladder operation and previous catheterisation.
↵b Strains resistant to both trimethoprim and ampicillin were included in both analyses.