Table 4 Study population, predictive values of the Nurse-WIS and results of the final logistic regression model to test further predictors (n = 225)

Gender

Female

88.7% (172)

11.3% (22)

Male

96.8% (30)

3.2% (1)

0.166

-

Age

≤ 35 years

88.6% (62)

11.4% (8)

36 to 45 years

92.2% (59)

7.8% (5)

46 to 55 years

91.7% (66)

8.3% (6)

> 55 years

78.9% (15)

21.1% (4)

0.358

-

Education

Lower secondary, elementary school certificate

87.7% (57)

12.3% (8)

Secondary school certificate

88.7% (102)

11.3% (13)

High school/university entrance certificate

95.6% (43)

4.4% (2)

0.351

-

Vocational training

Qualified geriatric nurse or nurse

90.4% (132)

9.6% (14)

Geriatric care or nursing assistant

86.5% (45)

13.5% (7)

Employee without nursing training

92.6% (25)

7.4% (2)

0.640

-

Length of service

0–10 years

91.0% (81)

9.0% (8)

11–20 years

91.7% (66)

8.3% (6)

21–30 years

86.1% (31)

13.9% (5)

More than 30 years

85.7% (24)

14.3% (4)

0.692

-

Scope of employment

Full time (≥35 hours a week)

92.3% (144)

7.7% (12)

Part time (<34 hours a week)

66.7% (58)

15.9% (11)

0.060

-

Working hours

Rotating shifts excluding nights/

Day duty, always at the same times

88.3% (136)

11.6% (18)

Rotating shifts including nights/

-

Only night work

93.0% (66)

7.0% (5)

0.183

Long-term sick leave because of other illnesses ² in T1

No

90.9% (80)

9.1% (8)

Yes

89.1% (122)

10.9% (15)

0.653

-

Long-term sick leave or application for pension for reduced work capacity ³ in T1

No

92.1% (199)

7.9% (17)

1

Yes

33.3% (3)

66.7% (6)

<0.001

17.4 (3.34–90.55)

Predictive values of Nurse-WIS

Low/moderate risk

96.3% (155)^§

3.6% (6)

1

Increased risk

73.4% (47)

26.6% (17)^#

<0.001

8.2 (2.90–23.07)