Benzodiazepine prescription and length of hospital stay at a Japanese university hospital

Table 1 Odds ratios (95% confidence intervals, C.I.) for benzodiazepine prescription (BDZ) to 21,489 inpatients

		N	%BDZ	Odds ratio	(95%C.I.)^a
Age, years
	18 to 44	5,023	14.0	---
	45 to 64	6,028	19.8	1.51	(1.37, 1.68)
	65 to 74	5,355	22.7	1.80	(1.63, 2.00)
	75 or older	5,083	23.0	1.83	(1.65, 2.03)
Sex
	Male	11,844	18.6	---
	Female	9,645	21.6	1.21	(1.13, 1.29)
Number of bed days
	4 or shorter	5,938	9.1	---
	5 to 13	5,258	16.5	1.98	(1.76, 2.22)
	14 to 49	4,917	22.8	2.96	(2.65, 3.31)
	50 or longer	5,376	32.7	4.86	(4.37, 5.40)

^aThe variables age and sex from logistic regression analysis were used to estimate a crude odds ratio for benzodiazepine prescription.
For the number of bed days, multiple logistic regression analysis was used to estimate the odds ratio for benzodiazepine use, adjusted by age, sex, and ICD-10 diagnosis.

ISSN: 1751-0759