Skip to main content

Table 1 Number of hospitalisations for confusion or falls avoided assuming cessation of one hypnotic

From: Reducing hypnotic use in insomnia management among Australian veterans: results from repeated national interventions

Hospitalisation for confusion (18)

Number of hypnotics

Number of Confusion

Person-Years

Adjusted rate per 10 years (95% CI)

Incidence rate ratio (95%)

Adjusted rate difference per 10 years

Adjusted rate difference per month

Total hospitalisations for confusion avoided

0

156

21,491

0.049 (0.032–0.074)

1.00 (1.00–1.00)

–

–

–

1

118

16,773

0.052 (0.034–0.081)

1.07 (0.84–1.36)

0.0035

0.000029

1

2

76

5078

0.12 (0.074–0.18)

2.39 (1.79–3.19)

0.064

0.00054

11

3

24

1503

0.14 (0.078–0.24)

2.79 (1.78–4.38)

0.020

0.00016

4

4

10

454

0.21 (0.10–0.43)

4.26 (2.20–8.25)

0.072

0.00060

12

> = 5

17

200

0.94 (0.51–1.73)

19.35 (11.10–33.72)

0.733

0.0061

128

Hospitalisation for falls (15)

Number of hypnotics

Number of Falls

Person-Years

Adjusted rate per 10 years (95% CI)

Incidence rate ratio (95%)

Adjusted rate difference per 10 years

Adjusted rate difference per month

Total hospitalisations for falls avoided

0

518

20,448

0.17 (0.13–0.23)

1.00 (1.00–1.00)

–

–

–

1

527

16,945

0.21 (0.16–0.28)

1.22 (1.08–1.38)

0.038

0.00031

7

2

246

5231

0.29 (0.22–0.40)

1.70 (1.45–1.99)

0.084

0.00070

15

3 to 4

108

1946

0.34 (0.24–0.48)

1.96 (1.58–2.43)

0.045

0.00037

8

> = 5

16

189

0.55 (0.31–0.96)

3.15 (1.90–5.23)

0.21

0.0017

36

  1. Data on number of confusion, number of falls, person-years, adjusted rates per 10 years and incidence rate ratio were taken from the two retrospective cohort studies which have been published previously (15,18)
  2. Total number of hospitalisation for confusion or hospitalisation for falls prevented were calculated by multiplying the number of patient-months of treatment avoided, which was 20,850, with the adjusted risk difference per month
  3. Note: We assumed cessation of one hypnotic (e.g. from two hypnotics to one) as a conservative estimate. The number of hospitalisation for confusion or hospitalisation for falls prevented would have been higher if patients had reduction of two or more hypnotics