Table 1. Outcomes from household survey of antimicrobial drugs and interviews of an adult member of the household about behavior in relation to these drugs, United Kingdom, 2003*.

Data		Antibacterial or antifungal drugs, % (95% CI)	Antibacterial drugs, % (95% CI)	Antifungal drugs, % (95% CI)
Household-based (6,983 households)
	Households with drug	18.9 (18.0–19.9)	13.9 (13.1–14.8)	6.9 (6.3–7.6)
	Households with current drug	10.6 (9.9–11.4)	7.9 (7.2–8.5)	3.6 (3.2–4.1)
	Households with leftover drug	6.2 (5.7–6.8)	4.5 (4.0–5.0)	2.1 (1.8–2.5)
	Households with standby drug	3.7 (3.3–4.2)	2.4 (2.1–2.8)	1.5 (1.2–1.8)
	Households with leftover or standby drug	9.6 (8.9–10.3)	6.7 (6.1–7.3)	3.5 (3.1–4.0)
Antimicrobial drug–based (506 leftover, 292 standby)
	Leftover drug >1 y old	38 (33–44)	32 (27–38)	55 (46–63)
	Standby drug >1 y old	31 (26–37)	29 (23–37)	36 (28–46)
	Leftover drug is more than half left	48 (43–53)	50 (44–56)	44 (36–53)
Respondent-based (7,120 respondents)
	Respondent had a leftover drug that was originally prescribed	3.9 (3.4–4.4)†	2.8 (2.4–3.3)	1.2 (1.0–1.5)
	Respondent prescribed a drug in the last year	37.6 (36.4–38.8)
	Respondent kept leftover drug from their most recent prescription	5.9 (5.0–7.0)
	Respondent kept drug in case of future need	44 (35–52)

*Some prescriptions contained both antibacterial and antifungal drugs and contribute to all 3 columns. CI, confidence interval.
†This outcome is examined in more detail in Table 2.