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Convergent Validity of Thoracic Outlet Syndrome Index (TOSI)

Authors:

Niina Ruopsa,

Research Institute Orton, Helsinki, FI
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Heidi Vastamäki,

Mehiläinen Neo Sports Hospital, Turku; Research Institute Orton, Helsinki, FI
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Leena Ristolainen,

Orton Orthopaedic Hospital, Helsinki, FI
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Martti Vastamäki ,

Research Institute Orton, Helsinki, FI
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Mikhail Saltychev

University of Turku, Turku, FI
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Abstract

No disease-specific evaluation score for thoracic outlet syndrome (TOS) patients was available prior to the presentation of the Thoracic Outlet Syndrome Index (TOSI) score. Our aim was to assess the convergent validity of the TOSI when compared with the short form of Disabilities of the Arm, Shoulder and Hand (QDASH), the Cervical Brachial Symptom Questionnaire (CBSQ), and pain numeric rating scale (painNRS) after supraclavicular rib-sparing decompression for neurogenic TOS. The TOSI takes into account five domains important to TOS patients with 15 questions, whereas QDASH considers only four domains, and CBSQ and painNRS each has only one domain. Our 67 TOS patients, mean age 36.5 years at surgery, were evaluated clinically for a mean 13.2 years after rib-sparing surgery. They completed the QDASH, the CBSQ, the pain NRS, and the TOSI questionnaires. Correlations between TOSI total score and QDASH, CBSQ total scores, and the painNRS were strong: 0.67 for TOSI vs. QDASH; 0.75 for TOSI vs. CBSQ; and 0.65 for TOSI vs. painNRS. The TOSI demonstrated good convergent validity. It may thus become a valuable addition among tools for assessing the quality of life and functioning of those with neurogenic thoracic outlet syndrome as well as for improving comparability of results across varying settings in this field.

How to Cite: Ruopsa, N., Vastamäki, H., Ristolainen, L., Vastamäki, M., & Saltychev, M. (2022). Convergent Validity of Thoracic Outlet Syndrome Index (TOSI). Physical Activity and Health, 6(1), 16–25. DOI: http://doi.org/10.5334/paah.162
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  Published on 09 Mar 2022
 Accepted on 27 Jan 2022            Submitted on 12 Jan 2022

Introduction

Thoracic outlet syndrome (TOS) is a disorder with a diverse pathology including symptoms related to the neck, shoulder, upper chest, head, and upper limb, impairing the patient’s quality of life and ability to work. Patients may present with pain, weakness, numbness, and paraesthesia. Especially raising the arms provokes symptoms. Many general and region-specific outcome measures exist to evaluate the three main consequences of neurogenic thoracic outlet syndrome (NTOS), pain, limitations in activities of daily living, and reduced work capacity. The scales most commonly used focus separately on either pain or functional limitations. Such scales include the short form of the Disabilities of the Arm, Shoulder and Hand (QDASH) (Caputo et al. 2013; Glynn et al. 2012; Ransom et al. 2020), the Cervical Brachial Symptom Questionnaire (CBSQ) (Caputo et al. 2013; Glynn et al. 2012; Ransom et al. 2022; Rochlin et al. 2013), and the pain numeric rating scale (NRS) (Jensen & Karoly 1991). These scales can evaluate the outcome of both conservative and surgical treatment of TOS. The QDASH and the CBSQ have proven to be valid tools to quantify the limitations of functioning of the upper extremity and the overall quality of life of respondents (Beaton, Wright & Katz 2005). Problematic, however, is that there has never been any disease-specific evaluation score for TOS, and researchers have had to use multiple scores simultaneously to provide comprehensive information regarding severity of pain, limitations in functioning, and quality of life (Balderman et al. 2017; Bosma et al. 2010; Chang et al. 2009; Cordobes-Gual et al. 2008; Ransom et al. 2022; Rochlin et al. 2013; Weiss & Chang 2013). This makes comparison of results difficult.

To avoid needing to use several TOS-nonspecific scales simultaneously, the present research group developed the 15-item Thoracic Outlet Syndrome Index (TOSI) (Vastamäki et al. 2020). This index provides both face- and content validity as well as being an internally consistent tool to evaluate TOS patients’ quality of life (QoL). Because the TOSI is a new scale, its correlation with other relevant scales (convergent validity) has never been subjected to study. The TOSI may allow comprehensive evaluation of the entire multidimensional spectrum of the TOS impact on patients’ health: pain, limitation in function(ing), and quality of life. If found valid, the TOSI may help clinicians assess the functioning of TOS patients by means of a single score. Such assessments may lead to improved comparability of results across varying settings.

Our purpose was to assess the convergent validity of TOSI when compared with the QDASH, the CBSQ, and painNRS after supraclavicular rib-sparing decompression due to neurogenic TOS.

Methods

Cross-sectional data on 67 consecutive patients undergoing surgery for NTOS between 1997 and 2011 came from patient records (Ruopsa et al. 2021). All the operations were performed by a single surgeon (M.V.) at a tertiary orthopaedic clinic. All the patients underwent a supraclavicular decompression scalenotomy without resection of the first rib, as described by Sanders (1996). A questionnaire containing the QDASH, the CBSQ, the pain NRS, and the TOSI went to the patients in 2019, a mean 13.2 (SD 4.6) years after surgery (Figure 1). The clinical routine follow-up appointments were with the same surgeon who performed the operations. The final follow up appointment was with the first author in 2021 (N.R.).

Frequency plot of time between surgery and response to the survey.
Figure 1 

Frequency plot of time between surgery and response to the survey.

The TOSI, exploring the quality of life of patients with TOS, comprises 15 items organized in five subgroups: physical symptoms (items 1 to 7), sports/recreation (8, 9), work (10 to 13), lifestyle (14), and emotions (15) (Vastamäki et al. 2020). These items are scored on a Likert-like scale from zero to 10, where zero represents “no limitation” and 10 “worst possible limitation”. The total score is the sum of the items’ scores with a minimum of zero and maximum of 150 points. The QDASH is an 11-item questionnaire. Its items are measured on a Likert-like scale from zero to five, where zero represents “no limitation” and five “worst possible limitation”. The total score ranges from zero point (“no symptoms, no difficulty”) to 100 points (“unable to perform tasks due to severe difficulty”) (Bosma et al. 2005). The 14-item CBSQ was originally developed to measure limitations of functioning among patients with cervicobrachial symptoms, neurogenic TOS, and related disorders (Jordan, Ahn & Gelabert 2007). CBSQ items are measured on a Likert-like scale from zero to 10, where zero represents “no symptoms” and 10 “constant severe symptoms”. The total score is the sum of items’ scores with a minimum of zero and maximum of 140 points. PainNRS is an 11-point Likert-like scale from zero (“no pain”) to 10 (“the worst possible pain”) (Table 1).

Table 1

Items of the TOSI, the CBSQ, and the QDASH, in brief.


TOSI

1. Pain in shoulder or arm

2. Pain in axilla, thorax, neck, or cheek

3. Weakness

4. Tingling or numbness

5. Pain with arm overhead

6. Tingling or numbness after rest

7. Clumsiness when holding objects

8. Difficulty with household chores

9. Difficulty in recreational activities

10. Difficulty in working with arm overhead

11. Compensating by using the healthy arm

12. Difficulty in working overall

13. Difficulty with heavy household chores

14. Difficulty in sleeping

15. Being worried about difficulty in working

CBSQ

1. Pain due to neck movement

2. Pain due to brief shoulder movement

3. Pain or fatigue with arm overhead

4. Swelling after exercise

5. Tingling or numbness when moving arm

6. Tingling or numbness after rest

7. Tingling or numbness when writing

8. Tingling or numbness when grasping

9. Tingling or numbness when leaning on elbow

10. Clumsiness when holding objects

11. Pain due to usually non-painful experience

12. Disabling long-lasting pain after light activities

QDASH

1. Difficulty when opening a jar

2. Difficulty in household chores

3. Difficulty when carrying bag

4. Difficulty when washing own back

5. Difficulty when using a knife

6. Difficulty in recreational activities

7. Difficulty in social activities

8. Difficulty in working

9. Pain

10. Tingling

11. Difficulty in sleeping

The TOSI, QDASH, and CBSQ show many similarities, but are far from identical. TOSI and CBSQ include three and five questions about pain, but QDASH only one. The CBSQ has five questions about tingling and numbness, TOSI only two, and QDASH only one. Actually, CBSQ only measures pain and physical symptoms, completely ignoring coping at work or daily life activities, and omitting life style and emotions. QDASH, on the other hand, focuses on many activities in daily life that are not significantly affected by TOS.

Age was recorded at the time of surgery and at the time of response. Body mass index (BMI) was calculated as weight/height2 (kg/m2). We calculated also BMI, because some authors have evaluated the influence of body weight on technical and functional outcomes of surgical treatment for NTOS (Maqbool et al. 2019; Mattox et al. 2016; Ohman et al. 2018). We also were interested in this topic (Ruopsa et al. 2021). Symptom duration we calculated as years from symptom onset until surgery (Table 2).

Table 2

Participant Characteristics.


VARIABLES MEAN ± SD

Age at surgery, years 36.5 ± 10.2

Age at response, years 49.7 ± 10.5

BMI1, kg/m2 27.8 ± 6.1

Symptom duration, years 4.2 ± 3.7

1 Body mass index.

We compared the total scores of TOSI, QDASH, CBSQ, and painNRS by using the Spearman correlation coefficient with the Bonferroni correction for multiple correlations. A correlation of ≥0.70 was considered very strong, 0.40 to 0.69 strong, 0.30 to 0.39 moderate, 0.20 to 0.29 weak, and 0.01 to 0.19 as none or a negligible correlation (Lawshe 1975). The estimates were accompanied by 95% confidence intervals (95% CIs). All the analyses were with Stata/IC Statistical Software: Release 16, College Station (StataCorp LP, TX, USA).

Results

Participant Characteristics

For neurogenic TOS, 67 patients, mean age 36.5 (SD 10.2) at surgery, 55 (82%) of them women, underwent surgery (Table 2). The mean follow-up was 13.2 (SD 4.6) years. The right side underwent surgery in 40 (60%) patients, the left side in 23 (34%), and both sides in 4 (6%). No re-operations were necessary. For questionnaire results, see Table 3.

Table 3

Participant questionnaire results.


VARIABLES MEAN ± SD

Pain, points 3.7 ± 3.3

CBSQ1, points 55.5 ± 34.1

QDASH2 total score, points 26.2 ± 11.1

TOSI3 66.6 ± 40.1

1 Cervical Brachial Symptom Questionnaire; 2 Quick Disabilities of the Arm, Shoulder and Hand; 3 Thoracic Outlet Syndrome Index.

Comparisons between TOSI, QDASH, and CBSQ domains

TOSI measures all five important domains in TOS: pain and physical symptoms, sports and recreation, work, lifestyle, and emotions, QDASH measures four domains, and CBSQ only one, pain and physical symptoms (Table 4).

Table 4

Number of question for each domain between TOSI, QDASH, and CBSQ.


DOMAIN TOSI1 QDASH2 CBSQ3

Pain and physical symptoms

    Pain 3 1 5

    Weakness 1 0 0

    Tingling, numbness 2 1 5

    Clumsiness 1 0 1

    Swelling 0 0 1

Sports and recreation 2 2 0

Work 4 2 0

    Lighter tasks 0 4 0

Lifestyle 1 1 0

Emotions 1 0 0

1 Thoracic Outlet Syndrome Index, 2 Short form Disabilities of the Arm, Shoulder and Hand, 3 Cervical Brachial Symptom Questionnaire.

The bolded rows indicate five domains for evaluating quality of life.

The most common symptoms of TOS are pain, numbness, loss of strength, and loss of function. TOSI measures numbness and tingling by two questions, QDASH by one, and CBSQ by five. Loss of power is also a variable to be measured, only in TOSI. Functioning is measured by TOSI by six questions and by QDASH by eight. CBSQ does not measure functioning. TOSI measures emotions by one question, the others omit it (Table 4).

Correlations between TOSI, CBSQ, QDASH, and painNRS

Strong positive correlations emerged between most of the similar items included in the TOSI, the CBSQ and the QDASH (Table 5). All items included in the TOSI showed strong correlations with pain severity measured by an NRS. The total scores of all three scales were also strongly correlated. All correlations between total scores were strong: TOSI vs. the QDASH 0.66 (95% CI 0.54 to 0.80); TOSI vs. the CBSQ 0.73 (95% CI 0.59 to 0.82), and TOSI vs. pain NRS 0.64 (95% CI 0.46 to 0.77). Moreover, correlations between individual items of all the scales were mostly strong or very strong, with a few exceptions. QDASH item #1 (Difficulty when opening a jar) showed mostly weak or negligible correlations with the TOSI items or the TOSI total score except for TOSI item #7 (Clumsiness when holding objects).

Table 5

Correlations between the TOSI and the CBSQ, the QDASH, and pain numerical rating scale. Very strong correlations in dark grey boxes, strong in light grey, and moderate, weak or insignificant in white. Significant correlations (P < 0.05) in bold.


COMPARATORS TOSI3

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 TOTAL

CBSQ1

1 0.50 0.56 0.46 0.44 0.54 0.37 0.55 0.58 0.53 0.47 0.47 0.41 0.60 0.47 0.29 0.54

2 0.42 0.50 0.52 0.51 0.57 0.39 0.60 0.56 0.51 0.46 0.50 0.41 0.58 0.41 0.33 0.53

3 0.43 0.46 0.57 0.51 0.63 0.42 0.58 0.55 0.53 0.60 0.51 0.42 0.62 0.39 0.37 0.55

4 0.58 0.58 0.60 0.52 0.64 0.54 0.70 0.62 0.62 0.62 0.63 0.40 0.58 0.55 0.36 0.64

5 0.48 0.51 0.58 0.55 0.69 0.48 0.65 0.60 0.57 0.62 0.58 0.49 0.61 0.48 0.46 0.60

6 0.54 0.57 0.54 0.50 0.58 0.58 0.60 0.59 0.54 0.41 0.57 0.37 0.55 0.49 0.35 0.61

7 0.54 0.53 0.58 0.53 0.62 0.45 0.61 0.67 0.62 0.59 0.63 0.63 0.68 0.45 0.53 0.63

8 0.60 0.57 0.69 0.59 0.75 0.54 0.70 0.75 0.72 0.69 0.71 0.60 0.74 0.53 0.49 0.72

9 0.43 0.53 0.55 0.53 0.61 0.36 0.53 0.54 0.53 0.53 0.45 0.41 0.57 0.46 0.38 0.56

10 0.33 0.43 0.52 0.45 0.44 0.29 0.63 0.50 0.50 0.43 0.47 0.38 0.48 0.25 0.32 0.48

11 0.44 0.48 0.45 0.47 0.52 0.37 0.58 0.52 0.42 0.43 0.53 0.32 0.48 0.45 0.27 0.53

12 0.55 0.58 0.60 0.61 0.68 0.51 0.64 0.65 0.60 0.59 0.68 0.54 0.65 0.59 0.48 0.70

Total 0.60 0.65 0.70 0.65 0.74 0.55 0.76 0.74 0.69 0.66 0.68 0.55 0.74 0.56 0.46 0.73

QDASH2

1 0.08 0.11 0.29 0.17 0.32 0.12 0.49 0.37 0.30 0.36 0.20 0.08 0.34 0.18 –0.04 0.27

2 0.53 0.45 0.55 0.47 0.60 0.41 0.58 0.67 0.66 0.62 0.57 0.60 0.78 0.54 0.43 0.64

3 0.41 0.31 0.49 0.34 0.49 0.30 0.49 0.57 0.44 0.61 0.40 0.37 0.63 0.47 0.24 0.49

4 0.38 0.31 0.51 0.33 0.42 0.27 0.50 0.45 0.44 0.46 0.42 0.33 0.46 0.25 0.17 0.43

5 0.33 0.32 0.34 0.32 0.46 0.23 0.55 0.59 0.49 0.42 0.44 0.31 0.57 0.41 0.24 0.48

6 0.43 0.42 0.49 0.46 0.57 0.35 0.49 0.56 0.53 0.57 0.45 0.40 0.64 0.50 0.28 0.54

7 0.46 0.47 0.53 0.47 0.67 0.39 0.55 0.60 0.51 0.64 0.56 0.41 0.66 0.55 0.37 0.61

8 0.40 0.38 0.49 0.39 0.63 0.30 0.53 0.61 0.54 0.64 0.52 0.51 0.69 0.52 0.41 0.57

9 0.51 0.44 0.49 0.43 0.55 0.40 0.49 0.55 0.50 0.51 0.44 0.38 0.61 0.54 0.35 0.56

10 0.50 0.51 0.54 0.56 0.63 0.48 0.59 0.59 0.50 0.53 0.50 0.34 0.54 0.58 0.34 0.61

11 0.51 0.48 0.60 0.41 0.57 0.43 0.45 0.57 0.48 0.53 0.45 0.40 0.64 0.59 0.33 0.59

Total 0.53 0.48 0.61 0.51 0.67 0.43 0.65 0.68 0.61 0.67 0.57 0.47 0.74 0.58 0.36 0.66

Pain

Pain NRS 0.54 0.56 0.56 0.55 0.65 0.54 0.63 0.6 0.57 0.53 0.53 0.43 0.6 0.5 0.4 0.64

1Cervical Brachial Symptom Questionnaire; 2Quick Disabilities of the Arm, Shoulder and Hand; 3Thoracic Outlet Syndrome Index

As shown in Table 5, there were slightly more correlations between the CBSQ and the TOSI than for the QDASH vs. the TOSI. For the CBSQ, the score of each item was positively and significantly interconnected with several items of the TOSI. For the QDASH, the score of each item was also positively and significantly interconnected with several items of the TOSI with only one exception – the QDASH item #1 did not demonstrate any relation to any of the TOSI items. When looking at this matrix from the point of the TOSI, all the items showed some positive and significant correlations with at least two items of the CBSQ. A similar result was observed for the correlations between the TOSI items and the QDASH items with three exceptions: the TOSI item #2 was correlated with a single item of the QDASH, the TOSI items #6 and #15 were not interconnected with any of the QDASH items. The total score of TOSI correlated positively and mostly strongly with both the QDASH and the CBSQ total scores.

Discussion

Strong positive correlations emerged between most of the similar items included in the TOSI, the CBSQ, and the QDASH. All items included in the TOSI showed strong correlations with pain severity as measured by the NRS. The total scores of all three scales were also strongly correlated. We tried here to focus on the features of our new test, in order to show that this new scoring tool measures the same domains as do the older ones. Additionally, our intention was to show what novelty the new measure provides–that is, where the correlations were weak because of the lack of similar questions in earlier measures. As TOSI is a new instrument, there as yet exist no other studies concerning any correlation between it and other instruments to measure quality of life.

CBSQ and DASH have each served as a tool for evaluating quality of life for TOS patients (Cordobes-Gual et al. 2008; Rochlin et al. 2013). TOSI question 15 (Being worried about difficulty in working) correlated quite poorly with CBSQ or QDASH. In NTOS patients, work ability is often threatened, and this may, based on our 45 years` experience, cause mental stress which further complicates symptoms. Mental stress is very rarely mentioned in the TOS literature, however. We found only one mention concerning NTOS: “Patients with NTOS reported significantly lower aggregate mental health QoL than patients with vascular-only TOS” (Al Rstum et al. 2020). Similarly, TOSI question 12, on difficulty in working overall, correlates quite poorly with CBSQ and QDASH; CBSQ does not measure work capacity at all, and QDASH measures it by one question. TOSI adds to the old scales four questions on ability to work, questions 10, 12, 13, and 15.

TOSI question 6, tingling or numbness after rest, question 2, pain in axilla, thorax, neck, or cheek, and question 4, tingling or numbness, correlated poorly with QDASH, and so did TOSI question 6 with QDASH. All those symptoms are common in TOS. For evaluation of functioning and QoL, they are important. Apparently, TOSI was able to identify those symptoms better than did the other measures. The absence of these questions from the evaluation form most obviously causes the possibility of error. On the other hand, TOSI correlated strongly with painNRS. reflecting the fact that in TOS the main symptom is pain.

In both the CBSQ and TOSI, most items are meant to capture physical issues, and in the QDASH and TOSI to measure limitations of functioning. Higher correlations can thus be expected between these tests. Based on the correlation matrix in Table 5, it seems that while the CBSQ could be replaced by the TOSI, the QDASH could still provide additional information on the functioning of those with TOS. In other words, the TOSI and the QDASH should probably be used concurrently. TOSI and pain NRS both typify issues with pain, so correlations between them are unsurprising.

We acknowledge some limitations. The generalizability of these results may be compromised by the retrospective design of our study, its small sample size, and its relatively small spectrum of variables available for analysis. A number of confounding factors may affect the strength of the correlations observed, one being the time interval between surgery and the questionnaire, and other problems occurring in patients’ upper limbs. Recall bias may be likely, when patients had to complete questionnaires concerning their preoperative situation at follow-up. That over 80% of the patients were women, with most of them relatively young, may also distort any correlations with populations that have different gender- or age distributions. However, it must be remembered that TOS is a disease of young people everywhere, mostly of women, and is very rare in those over age 45.

In addition, this study sample was drawn from a specific population of patients after scalenotomy without rib resection. In theory, the TOSI may behave differently in other patient groups. In addition, the TOSI score has been validated only in Finnish. It is possible that the validation results in English, for example, may be different. And some TOSI questions may be too close to each other thus perhaps overemphasizing the issue in question such as question 5, Pain with arm overhead, and question 10, Difficulty in working arm overhead, as well as question 10, and question 12 “Difficulty in working overall”. However, the difficulty of these activities is typical and very common in the TOS, so that over-representation of those items is unlikely.

Our Thoracic Outlet Syndrome Index TOSI appeared to correlate with other forms, so in the future it may not have been necessary to use many different forms to explore the QoL of TOS patients, because one would suffice. However, this single study is insufficient to show the usability of the form, meaning that further research is necessary.

Conclusions

The Thoracic Outlet Syndrome Index TOSI demonstrated good convergent validity and may become a valuable addition to the assessment of functioning and quality of life of individuals with neurogenic thoracic outlet syndrome.

Institutional Review Board Statement

The study was conducted according to the guidelines of the Declaration of Helsinki, and approved by the Institutional Review Board (or Ethics Committee) of Helsinki University (protocol code 1755/2017, 07.02.2018).

Ethics and Consent

Written informed consent was obtained from all subjects involved in the study.

Acknowledgements

We thank Carolyn Brimley Norris, PhD, for language revision.

Funding Information

The institution of the authors has received, during the study period, funding from Orton EVO grants (A2500/458) from the Ministry of Social Affairs and Health, Finland.

Competing Interests

The authors have no competing interests to declare.

Author Contributions

Conceptualization M.V., N.R., L.R., and H.V.; methodology, N.R., H.V., L.R., M.V. and M.S.; software, L.R. and M.S.; validation, N.R., H.V., L.R., M.V., and M.S.; formal analysis, N.R., L.R., M.V. and M.S; patient investigation, N.R. and H.V.; resources, L.R. and M.V.; data curation, N.R., H.V., L.R., M.V., and M.S.; writing—original draft preparation, N.R. and M.V.; writing—review and editing, N.R., H.V., L.R., M.V. and M.S.; visualization, L.R.; supervision, H.V., M.V., and L.R.; project administration, M.V.; funding acquisition, N.R., H.V., L.R., and M.V. All authors have read and agreed to the submitted version of the manuscript.

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