Validation of the Croatian Version of Work Ability Index (WAI) in Population of Nurses on Transformed Item-Specific Scores

Item		Number of questions	Scoring (min-max)
Item-1	Current work ability compared with the lifetime best	1	0–10
Item-2	Work ability in relation to the demands of the job	2	2–10
Item-3	Number of current diseases diagnosed by a physician	1	1–7
Item-4	Estimated work impairment due to diseases	1	1–6
Item-5	Sick leave during the past year (12 months)	1	1–5
Item-6	Own prognosis of work ability 2 years from now	1	1,4,7
Item-7	Mental resources	3	1–4

Table 2

Intercorrelations between the scores of seven items of the Croatian version of the Work Ability Index Questionnaire in Croatian nurses (n=711).

	Item-1	Item-2	Item-3	Item-4	Item-5	Item-6	Item-7
Item-1	1.000
Item-2	0.636	1.000
Item-3	0.279	0.208	1.000
Item-4	0.416	0.408	0.444	1.000
Item-5	0.183	0.160	0.271	0.298	1.000
Item-6	0.383	0.341	0.309	0.393	0.218	1.000
Item-7	0.257	0.374	0.127	0.272	0.126	0.276	1.000

Table 3

Factor saturation estimated by confirmatory factor analysis of the Croatian version of the Work Ability Index Questionnaire in Croatian nurses (n=711).

Indicator	b	se	p	β
Item-1	1.000	0.000		0.577
Item-2	0.916	0.061	<0.001	0.554
Item-3	1.940	0.187	<0.001	0.535
Item-4	1.326	0.110	<0.001	0.733
Item-5	1.000	0.123	<0.001	0.386
Item-6	1.426	0.130	<0.001	0.582
Item-7	0.773	0.091	<0.001	0.407

[i] Legend: b=non-standardized saturation; se=saturation estimation error; p=significance of saturation; β=standardized saturation

Table 4

Factor saturation estimated by exploratory factor analysis of the Croatian version of the Work Ability Index Questionnaire in Croatian nurses (n=711).

Indicator	Factor-1	Factor-2	Factor-3
Item-1	0.784
Item-2	0.803
Item-3		0.693
Item-4		0.614
Item-5		0.446
Item-6		0.380
Item-7			0.997

Table 5

Correlations of factors identified by exploratory factor analysis of the Croatian version of the Work Ability Index Questionnaire in Croatian nurses (n=711).

	Factor-1	Factor-2	Factor-3
Factor-1	1.000
Factor-2	0.697	1.000
Factor-3	0.436	0.317	1.000

Table 6

Factor saturation estimated by confirmatory factor analysis of the Croatian version of the Work Ability Index Questionnaire in Croatian nurses (n=711).

Factor	Indicator	b	se	p	β
Factor-1	Item-1	1.000	0.000		0.785
	Item-2	0.986	0.064	<0.001	0.811
Factor-2	Item-3	1.000	0.000		0.551
	Item-4	0.683	0.058	<0.001	0.754
	Item-5	0.510	0.063	<0.001	0.393
	Item-6	0.699	0.066	<0.001	0.570
Factor-3	Item-7	1.000	0.000		1.000

[i] Legend: b=non-standardized saturation; se=saturation estimation error; p=significance of saturation; β=standardized saturation

Table 7

Correlations of factors identified by exploratory factor analysis of the Croatian version of the Work Ability Index Questionnaire in Croatian nurses (n=711).

	Factor-1	Factor-2	Factor-3
Factor-1	1.000
Factor-2	0.669	1.000
Factor-3	0.400	0.358	1.000

Table 8

Arithmetic mean and standard deviation of the three factors of the Croatian version of the Work Ability Index Questionnaire in Croatian nurses (n=711).

Typical value	Factor-1	Factor-2	Factor-3
Arithmetic mean	16.76	20.40	3.31
Standard deviation	2.81	4.05	0.77

References

Authors

Metrics

Articles in this issue

DOI: https://doi.org/10.2478/sjph-2020-0008 | Journal eISSN: 1854-2476 | Journal ISSN: 0351-0026

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Language: English, Slovenian

Page range: 57 - 64

Submitted on: Jul 19, 2019

Accepted on: Dec 18, 2019

Published on: Apr 6, 2020

Published by: National Institute of Public Health, Slovenia

In partnership with: Paradigm Publishing Services

Keywords:

psychometric properties,

work ability index questionnaire,

nurses,

Related subjects:

Hygiene and environmental medicine

© 2020 Martina Smrekar, Alenka Franko, Olivera Petrak, Lijana Zaletel-Kragelj, published by National Institute of Public Health, Slovenia
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Volume 59 (2020): Issue 2 (June 2020)