Evaluating Measurement Properties of the Adapted Interprofessional Collaboration Scale through Rasch Analysis
Abstract
:1. Introduction
- How well do the single items of the IPC scale measure the perception of interprofessional collaboration? (Model fit/misfit)
- How is the person–item difficulty for the single items of the IPC scale distributed? (Person–item map or Wright map)
- Are there items particularly critical to measure the construct? (Item polarity)
- Does the single-item difficulty relate to the main characteristics of the sample (language version, gender, work experience, age-class, and workplace)? (Differential item analysis, hereafter DIF)
- Is the IPC scale able to distinguish between persons with lower and greater collaborative behavior? (Person separation index)
2. Materials and Methods
2.1. Study Design and Sample
2.2. Instrument and Data Collection
2.3. Data Analysis
- INFIT and OUTFIT statistics are the most widely used diagnostic Rasch fit statistics. Comparison is made with an estimated value that is near to or far from the expected value. INFIT is more diagnostic when item measures are close to the person measures. OUTFIT is more diagnostic when item measures are far from the person measures.
- Observed average and outfit mean square values (MNSQ) were used to identify the compatibility of the data with the Rasch model.
- Uniform differential item functioning (DIF) was used to explore the stability of item difficulty to measure item invariance (item bias).
- The reliability of the scale was evaluated by calculating Cronbach’s alpha coefficient and a separation index for person and for items. The reliability reporting how reproducible the person and item measure orders are (i.e., their locations on the continuum) is shown in Table 1, together with the reference values for the previous indices. Item separation index and item reliability are interpreted using the same criteria. According to Rasch guidelines, if the item reliability and separation are below the required values, a bigger sample is necessary; if the person reliability and separation are below the required values, the test requires more items [20,22].
3. Results
3.1. Sample Characteristics
3.2. Reliability Measures and Separation Indexes
3.3. Item Polarity
3.4. Item Fit
3.5. Wright Map
3.6. Item Difference (DIF)
4. Discussion
Strengths and Limitations
5. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
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Criteria | Statistical Index | Reference Values | |
---|---|---|---|
Person and item reliability | Person and item separation index (SE) | Separation index (SE) of ≥2.0 and reliability value ≥0.8 [18,22] | |
Reliability of the scale | Cronbach’s alpha coefficient | Cronbach’s alpha | Internal consistency |
α ≥ 0.9 | Excellent | ||
0.9 > α ≥ 0.8 | Good | ||
0.8 > α ≥ 0.7 | Acceptable | ||
0.7 > α ≥ 0.6 | Questionable | ||
0.6 > α ≥ 0.5 | Poor | ||
0.5 > α | Unacceptable | ||
[24] | |||
Item validity | Item polarity | Point measure correlation (PTMea Corr.) >0 [18] | |
Item fit | Item dimensionality | Total mean square INFIT and OUTFIT within 0.5 to 1.5 [25] | |
Item misfit | INFIT and OUTFIT mean square (MNSQ) | All items value ≥2.0 [18] | |
Stability of item difficulty | Uniform differential item functioning (DIF) | (1) DIF contrast >0.5 logits, and (2) significance of the difference (t > 2.0) [22] |
Characteristics | Number (n = 1182) | Percentage (%) |
---|---|---|
Language | ||
German | 875 | 74.0 |
Italian | 307 | 26.0 |
Gender | ||
Female | 1030 | 87.1 |
Male | 138 | 11.7 |
Age (years) | ||
20–29 | 173 | 14.6 |
30–39 | 373 | 31.6 |
40–49 | 435 | 36.8 |
50–59 | 188 | 15.9 |
>60 | 6 | 0.5 |
Not answered | 7 | 0.6 |
Workplace | ||
Ward | 599 | 50.7 |
Service | 390 | 33.0 |
Not answered | 193 | 16.3 |
Work experience in the profession (years) | Mean: 18.0 | S.D. 9.8 |
Work experience in the current ward/service (years) | Mean: 10.9 | S.D. 8.5 |
Item Number | Item Description | PTMea Corr. Item |
---|---|---|
ITEM 10 | Important information is always passed on from us to the other profession. | 0.39 |
ITEM 12 | The other profession thinks their work is more important than ours. | 0.54 |
ITEM 1 | We have a good understanding with the other profession about our respective responsibilities. | 0.66 |
ITEM 4 | The other profession and us share similar ideas about how to care for patients. | 0.73 |
ITEM 13 | The other profession is willing to discuss their new practices with us. | 0.73 |
ITEM 9 | The other profession is anticipating when we will need their help. | 0.74 |
ITEM 3 | I feel that patient care is adequately discussed between us and the other profession. | 0.74 |
ITEM 11 | Disagreement with the other profession is often resolved. | 0.74 |
ITEM 2 | The other profession is usually willing to take into account the convenience for us when planning their work. | 0.75 |
ITEM 8 | The other profession does usually ask for our opinions. | 0.76 |
ITEM 5 | The other profession is willing to discuss clinical issues with us. | 0.76 |
ITEM 6 | The other profession cooperates with the way we organize patient care. | 0.76 |
ITEM 7 | The other profession is willing to cooperate with us concerning new practices. | 0.78 |
Entry Number | Item Logits Measures | Model S.E.M. | INFIT | OUTFIT | EXACT OBS% | MATCH EXP% | ||
---|---|---|---|---|---|---|---|---|
MNSQ | ZSTD | MNSQ | ZSTD | |||||
ITEM 10 | −2.87 | 0.07 | 1.83 | 9.9 | 2.40 | 9.9 | 60.5 | 74.7 |
ITEM 12 | 2.93 | 0.05 | 1.80 | 9.9 | 3.21 | 9.9 | 52.4 | 61.4 |
ITEM 1 | −0.70 | 0.06 | 0.93 | −1.5 | 1.02 | 0.4 | 71.6 | 68.4 |
ITEM 4 | −0.41 | 0.06 | 0.75 | −6.3 | 0.76 | −5.2 | 74.2 | 67.7 |
ITEM 13 | 0.64 | 0.05 | 0.94 | −1.5 | 0.92 | −1.7 | 70.0 | 64.7 |
ITEM 9 | 0.69 | 0.05 | 0.90 | −2.3 | 0.91 | −2.0 | 65.8 | 64.6 |
ITEM 3 | −0.51 | 0.06 | 0.90 | −2.4 | 0.88 | −2.5 | 69.8 | 68.1 |
ITEM 11 | 0.09 | 0.05 | 0.88 | −2.7 | 0.88 | −2.6 | 68.9 | 66.6 |
ITEM 2 | 0.30 | 0.05 | 0.81 | −4.6 | 0.81 | −4.4 | 73.1 | 65.8 |
ITEM 8 | 0.67 | 0.05 | 0.91 | −2.1 | 0.90 | −2.2 | 64.5 | 64.7 |
ITEM 5 | −0.66 | 0.06 | 0.95 | −1.1 | 0.89 | −2.3 | 68.6 | 68.3 |
ITEM 6 | −0.59 | 0.06 | 0.71 | −7.4 | 0.67 | −7.4 | 76.8 | 68.1 |
ITEM 7 | 0.41 | 0.05 | 0.68 | −8.4 | 0.66 | −8.3 | 74.3 | 65.7 |
MEAN | 0.00 | 0.06 | 1.00 | −1.6 | 1.15 | −1.4 | 68.5 | 66.8 |
S.D. | 1.24 | 0.00 | 0.36 | 5.4 | 0.73 | 5.3 | 6.3 | 3.0 |
Differential Item Functioning | IPC Scale |
---|---|
Gender | Item 12: higher agreement for males (0.69, p = 0.0015) |
Language | No DIF |
Work experience | No DIF |
Workplace | No DIF |
Age range | Item 8: higher agreement for nurses >50 vs. nurses 20–29 (0.56, p = 0.0151) |
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Wieser, H.; Mischo-Kelling, M.; Cavada, L.; Lochner, L.; Fink, V.; Naletto, C.; Vittadello, F. Evaluating Measurement Properties of the Adapted Interprofessional Collaboration Scale through Rasch Analysis. Healthcare 2022, 10, 2007. https://doi.org/10.3390/healthcare10102007
Wieser H, Mischo-Kelling M, Cavada L, Lochner L, Fink V, Naletto C, Vittadello F. Evaluating Measurement Properties of the Adapted Interprofessional Collaboration Scale through Rasch Analysis. Healthcare. 2022; 10(10):2007. https://doi.org/10.3390/healthcare10102007
Chicago/Turabian StyleWieser, Heike, Maria Mischo-Kelling, Luisa Cavada, Lukas Lochner, Verena Fink, Carla Naletto, and Fabio Vittadello. 2022. "Evaluating Measurement Properties of the Adapted Interprofessional Collaboration Scale through Rasch Analysis" Healthcare 10, no. 10: 2007. https://doi.org/10.3390/healthcare10102007