# Table 4

Summary of results of the final hierarchical multiple regression model: the dependent variable is the total fall rate per 1000 patient-days

R2

F change

Significance

Initial model summary (covariates only)

0.08

0.07

7.36

p < 0.001**

Final model summary (covariates and predictor)

0.10

0.09

24.24

p < 0.001**

Final model

ANOVA

Sum of squares (df)

Mean square

F value

Significance

Regression

975.75 (13)

75.06

8.81

p < 0.001**

Residual

8939.23 (1049)

8.52

Total

9914.98 (1062)

Covariates and predictor

Standardized coefficient (β)

t

Significance

(Constant)

--

8.06

p < 0.001**

Hospital 1 (the reference group)

--

--

--

Hospital 2 (1 = Yes, 0 = No)

-0.11

-2.06

0.04*

Hospital 3 (1 = Yes, 0 = No)

-0.22

-5.60

p < 0.001**

Hospital 4 (1 = Yes, 0 = No)

-0.05

-1.30

0.19

Medical unit (the reference group)

--

--

--

Surgical unit (1 = Yes, 0 = No)

-0.12

-3.16

0.002**

Medical-surgical combined unit (1 = Yes, 0 = No)

-0.09

-2.60

0.010*

Total productive nursing hours/patient-day

0.13

3.05

0.002**

Percentage of productive nursing hours provided by RNs

-0.30

-6.21

p < 0.001**

Percentage of patients aged ≥ 65 years

-0.07

-1.64

0.10

Average CMI value

0.06

1.75

0.08

Percentage of patients with altered mental status at admission

0.10

2.77

0.006**

Percentage of patients with hearing difficulties at admission

0.01

0.26

0.80

Call light use rate/patient-day (in 10 equal groups; 10 = least frequent, 100 = most frequent)

-0.07

-2.12

0.03*

Call light response time (in 10 equal groups; 10 = fastest, 100 = slowest)

0.15

4.92

p < 0.001**

*p < 0.05; **p < 0.01

Tzeng et al. BMC Health Services Research 2012 12:84   doi:10.1186/1472-6963-12-84