Measurement Properties of the Spinal Function Sort in Patients with Sub-acute Whiplash-Associated Disorders

Trippolini, Maurizio; Dijkstra, Pieter U.; Geertzen, Joannes; Reneman, Michiel F.

doi:10.1007/s10926-014-9559-9

Cited by 15 publications

(17 citation statements)

References 29 publications

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“…The most relevant findings from the quantitative analysis of 565 SFS’s obtained in previous studies [ 17 , 21 , 28 ] were the high Cronbach’s alpha values of 0.98 of all items, and 0.96 if the sample was split into two groups—one group with even and one group with odd numbered items; six items loaded on any of the with PCA identified six components of the SFS; mean square fit values from the Rasch analysis between 0.5 and 1.5 for all items except for items 45–48 with values >2.0; and large floor effects of four items depicting lifting tasks of 50 kg (items 45–48). These findings strongly support item reduction and modification of the SFS, as suggested in previous studies [ 17 , 18 , 40 ].…”

Section: Discussionsupporting

confidence: 91%

Development of a Modified Version of the Spinal Function Sort (M-SFS): A Mixed Method Approach

et al. 2015

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Purpose To develop a modified version of the spinal function sort (M-SFS) by measuring work-related self-efficacy beliefs in patients with chronic low back pain. Methods A mixed method design consisting of three different methods (M1–3) was performed. In semi-structured interviews participants were asked how often they performed the activities of the 50 SFS items in 1 week, and which spinal postures and movements were associated with their back pain (M1). Quantitative analysis of previously obtained SFS data investigated internal consistency, unidimensionality, item response, and floor and ceiling effect (M2). Experts rated the SFS items based on their relevance (M3). The findings from these methods were used within a final scoring system for item reduction. Results From semi-structured interviews with 17 participants, eight new items emerged (M1). Quantitative analysis of 565 data sets (M2) revealed very high internal consistency of all items (Cronbach’s alpha = 0.98) indicating item redundancy; unidimensionality of the SFS was supported by principal component analysis; good item response was confirmed by Rasch analysis; and a floor effect of four items depicting very heavy material handling was found. Experts agreed on 8 out of the 50 SFS as relevant (M3). From the original SFS, 12 items met the predefined summary score of 9. Conclusions A modified version of the SFS with 20 items has been developed. Feasibility, reliability and validity of this modified version must be tested before it can be used in clinical practice.

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Section: Discussionsupporting

confidence: 91%

Development of a Modified Version of the Spinal Function Sort (M-SFS): A Mixed Method Approach

et al. 2015

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“…However, the rating of 50 items is time-consuming, and a shorter version of the SFS is warranted. It has also been suggested that the number of SFS items could be reduced by half because of redundant items [ 12 , 13 ]. Another critique was that the SFS does not include pictures of prolonged work postures, ambulation and the images are outdated [ 12 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

Measurement Properties of the Modified Spinal Function Sort (M-SFS): Is It Reliable and Valid in Workers with Chronic Musculoskeletal Pain?

et al. 2017

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Purpose To analyze the reliability and validity of a picture-based questionnaire, the Modified Spinal Function Sort (M-SFS). Methods Sixty-two injured workers with chronic musculoskeletal disorders (MSD) were recruited from two work rehabilitation centers. Internal consistency was assessed by Cronbach’s alpha. Construct validity was tested based on four a priori hypotheses. Structural validity was measured with principal component analysis (PCA). Test–retest reliability and agreement was evaluated using intraclass correlation coefficient (ICC) and measurement error with the limits of agreement (LoA). Results Total score of the M-SFS was 54.4 (SD 16.4) and 56.1 (16.4) for test and retest, respectively. Item distribution showed no ceiling effects. Cronbach’s alpha was 0.94 and 0.95 for test and retest, respectively. PCA showed the presence of four components explaining a total of 74% of the variance. Item communalities were >0.6 in 17 out of 20 items. ICC was 0.90, LoA was ±12.6/16.2 points. The correlations between the M-SFS were 0.89 with the original SFS, 0.49 with the Pain Disability Index, −0.37 and −0.33 with the Numeric Rating Scale for actual pain, −0.52 for selfreported disability due to chronic low back pain, and 0.50, 0.56–0.59 with three distinct lifting tests. No a priori defined hypothesis for construct validity was rejected. Conclusions The M-SFS allows reliable and valid assessment of perceived self-efficacy for work-related tasks and can be recommended for use in patients with chronic MSD. Further research should investigate the proposed M-SFS score of <56 for its predictive validity for non-return to work.

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“…The relevant part was selected after expert evaluation and testing within the clinical setting. SFS has very good retest-reliability (ICC = 0.98; 95% CI: 0.97-1.00) (Borloz, Trippolini, Ballabeni, Luthi, & Deriaz, 2012;Trippolini, Dijkstra, Geertzen, & Reneman, 2015).…”

Section: Primary Outcome Variablesmentioning

confidence: 99%

Effectiveness and Economic Evaluation of Therapeutic Nordic Walking in Patients with Psychosomatic Disorders: A Pragmatic Randomized Controlled Trial

Watzek¹,

Mischler²,

Dorji³

et al. 2016

JPR

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The effects of exercise therapy in patients with psychosomatic disorders are modest. Therapeutic Nordic walking (tNW) might be a clinically meaningful and cost-effective additional treatment modality. This study aimed to investigate the effects of a tNW program on improving coping ability, compared to the usual care in highly disabled patients with diverse psychosomatic disorders in a hospital setting, and the willingness-to-pay for this treatment modality. Primary outcomes were self-efficacy, readiness to change health behavior, physical performance and attitude to walking. Economic evaluation was conducted with the willingness-to-pay questionnaire. Cohens' d and 95% confidence intervals were calculated for baseline, discharge and three month follow up using intention-to-treat analysis. Differences between groups were tested by t-test or nonparametric ANOVA. A total of 150 patients were included in this study. Results show no significant differences between the experimental and control group for any of the outcomes. Ratings of stages of change within the transtheoretical model were made by therapists or patients, they showed small effects within both groups (precontemplation: 0.2-0.4 points; preparation: 0.1-0.2; action: 0.4-1.1; maintenance: 0.4 for every comparison). There was no additional effect of the tNW program compared to the standard program in the outcome willingness-to-pay for tNW. However, since clinical experience and treatment expectancy of both patients and health care providers with this treatment modality play an important role in the treatment process, tNW might be a low-budget treatment option for some patients.

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Measurement Properties of the Spinal Function Sort in Patients with Sub-acute Whiplash-Associated Disorders

Cited by 15 publications

References 29 publications

Development of a Modified Version of the Spinal Function Sort (M-SFS): A Mixed Method Approach

Development of a Modified Version of the Spinal Function Sort (M-SFS): A Mixed Method Approach

Measurement Properties of the Modified Spinal Function Sort (M-SFS): Is It Reliable and Valid in Workers with Chronic Musculoskeletal Pain?

Effectiveness and Economic Evaluation of Therapeutic Nordic Walking in Patients with Psychosomatic Disorders: A Pragmatic Randomized Controlled Trial

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