Test-retest reproducibility of the Assessment of Motor and Process Skills for school-aged children with acquired brain injuries

Motor performance after treatment of pilocytic astrocytoma in the posterior fossa in childhood

Background

Pilocytic astrocytoma is the most common brain tumour type in childhood located in the posterior fossa, and treated mainly with surgery. These tumours have low mortality, but knowledge concerning its long‐term outcome is sparse.

Aims

The aim was to investigate if patients treated for pilocytic astrocytoma in the posterior fossa had motor complications, including balance, motor and process skills.

Methods and Results

This descriptive single‐centre study includes eight children and 12 adults, treated for pilocytic astrocytoma as children. Motor performance was investigated with Bruininks–Oseretsky Test of Motor Proficiency, Second Edition, and dynamic balance with the mini‐balance evaluation systems test. Physiological cost index, six‐minute walk test, hand grip strength and assessment of motor and process skills were also evaluated. Ten patients reported motor difficulties, mainly from the upper limbs. The motor performance test showed results within normal limits except for manual dexterity, which was significantly below mean (p = .008). In the dynamic balance test patients had significantly lower results compared with controls (p = .036). Physiological cost index, six‐minute walk tests and hand grip strength showed results within normal limits. In the Assessment of Motor and Process Skills, patients over 16 years had significantly lower results compared with test norms for motor activities of daily living (ADL) and 30% of all patients scored below the cut‐off level for difficulties with motor skills.

Conclusions

Motor performance for patients treated for pilocytic astrocytoma in the posterior fossa in childhood is satisfactory but some patients display difficulties with balance, manual dexterity and ADL motor skills. Thus, it is important to identify those in need of motor follow‐up and training.

Test-retest reliability of myelin imaging in the human spinal cord: Measurement errors versus region- and aging-induced variations

PURPOSE

To implement a statistical framework for assessing the precision of several quantitative MRI metrics sensitive to myelin in the human spinal cord: T1, Magnetization Transfer Ratio (MTR), saturation imposed by an off-resonance pulse (MTsat) and Macromolecular Tissue Volume (MTV).

METHODS

Thirty-three healthy subjects within two age groups (young, elderly) were scanned at 3T. Among them, 16 underwent the protocol twice to assess repeatability. Statistical reliability indexes such as the Minimal Detectable Change (MDC) were compared across metrics quantified within different cervical levels and white matter (WM) sub-regions. The differences between pathways and age groups were quantified and interpreted in context of the test-retest repeatability of the measurements.

RESULTS

The MDC was respectively 105.7ms, 2.77%, 0.37% and 4.08% for T1, MTR, MTsat and MTV when quantified over all WM, while the standard-deviation across subjects was 70.5ms, 1.34%, 0.20% and 2.44%. Even though particular WM regions did exhibit significant differences, these differences were on the same order as test-retest errors. No significant difference was found between age groups for all metrics.

CONCLUSION

While T1-based metrics (T1 and MTV) exhibited better reliability than MT-based measurements (MTR and MTsat), the observed differences between subjects or WM regions were comparable to (and often smaller than) the MDC. This makes it difficult to determine if observed changes are due to variations in myelin content, or simply due to measurement error. Measurement error remains a challenge in spinal cord myelin imaging, but this study provides statistical guidelines to standardize the field and make it possible to conduct large-scale multi-center studies.

Test-Retest Reliability of a Measure of Independence in Everyday Activities: The ADL Profile

Background

Very few performance-based measures used in occupational therapy have established test-retest reliability coefficients.

Objectives of Study

This study presents the test-retest reliability of the task and operation scores of a performance-based measure of independence in everyday activities called the ADL Profile.

Methods

20 adults with severe traumatic brain injury (mean age 28.4 years; SD 9.9) were tested on two occasions with the 17 tasks (personal care, home, and community) of the ADL Profile. Kappa coefficients were calculated on both task and operation scores (formulating goal, planning, executing, and goal attainment).

Findings

Test-retest reliability was moderate to almost perfect on task and operation scores of all 17 tasks. The three tasks with only moderate agreement were more novel and complex (e.g., making a budget) for the participants.

Relevance to Clinical Practice

Use of measures that are stable over time is essential for treatment planning and research. Repeat testing is crucial with clients that require long periods of treatment (acute care, rehabilitation, and community integration) and multiple measurements of ADL independence.

Limitations

The small sample size is a limit of the study.

Recommendations for Further Research

Alternate versions of the three tasks with only moderate agreement would need to be developed and other psychometric properties established.

Impact of multi-modal web-based rehabilitation on occupational performance and upper limb outcomes: pilot randomized trial in children with acquired brain injuries

AIMS

To determine whether the multi-modal web-based rehabilitation 'Move it to improve it' (Mitii) is more effective than wait list control (usual care) to improve occupational performance, upper limb function, and visual perception in children with acquired brain injury (ABI).

METHOD

Fifty-eight randomly allocated children (53% males; mean age 11y 11mo, SD 2y 6mo; Manual Abilities Classification Scale equivalent I=32, II=24, III=2; mean Full-scale IQ 75.8, SD 16.2) received either 20 weeks of Mitii (n=29) or usual care (n=29). Mitii comprised upper limb, cognitive, visual perception, and gross motor tasks, recommended for 30 minutes per day, 6 days per week, over 20 weeks. Outcomes were the Assessment of Motor and Process Skills (AMPS), Melbourne Assessment of Unilateral Upper Limb Function, Jebsen-Taylor Test of Hand Function, Test of Visual Perceptual Skills, Assisting Hand Assessment (AHA), and Canadian Occupational Performance Measure. The primary comparison at 20 weeks between groups on the AMPS process and motor measures used generalized estimating equations.

RESULTS

Groups were equivalent at baseline. Participants completed on average 17.6 hours (range 0-46h) of Mitii. There were no differences between groups on the primary outcome (AMPS process: estimated mean difference -0.1, 95% CI -0.3 to 0.2, p=0.589; and AMPS motor: estimated mean difference 0.2, 95% CI -0.1 to 0.5, p=0.192). There were no differences between groups on overall visual perception, upper limb, and occupational performance outcomes.

INTERPRETATION

Mitii led to negligible changes on all primary and secondary outcomes compared with usual care. This likely reflects the small dose achieved and poses questions around the acceptability and feasibility of home-delivered Mitii in this population of children with ABI.