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.

Nakao et al. BioPsychoSocial Medicine 2009 3:10   doi:10.1186/1751-0759-3-10