ABILOCO - Instructions

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  1. Downloading test packages
  2. Administering the questionnaire
  3. Analysing the subject’s responses
  4. Interpreting the locomotion ability measures


Downloading test packages

ABILOCO in adult stroke patients - ABILOCO Benin
The test packages for administrating the ABILOCO questionnaires are available for download to registered users. Registration is FREE and will only take a few minutes to complete. The test packages are available in two languages.

Each package contains the instruction sheet and the 10 scoring sheets (10 different random orders).


Administering the questionnaire

Figure 1 [+] Figure 1

The ABILOCO questionnaire is administered on an interview basis. Patients do not realise the activities, they are asked to estimate the difficulty of performing each activity.

The activities are presented in a random order to avoid any systematic effect. Ten different random orders of presentation are used. The evaluator selects the next one of the 10 orders for each new assessment, no matter which patient is tested.

During the evaluation, a 2-level response scale is presented to the patients. Patients are asked to rate their perception on the response scale as 'Impossible', or 'Possible'. Activities not attempted in the last 3 months are not scored and are entered as not applicable (check the question mark '?' on the scoring sheet). Activities not realised because they are too difficult must be scored as 'Impossible'.

The scores are entered as shown in the Figure 1.


Analysing the subject’s responses

The responses to the questionnaire can be submitted for an online analysis on this web site.

The analysis uses the Rasch model to convert the raw scores into a linear measure. The linear measure can be determined even when some items have not been answered (missing responses will only reduce the precision of the measure).

The online form is available with the items ordered in the 10 random orders used on the paper scoring sheets. Select the language and the order (1 to 10) that were used during the evaluation. Then enter the patient's responses into the online form and submit the form to display the evaluation report.


Interpreting the locomotion ability measures

Figure 2 [+] Figure 2

The evaluation report is presented in Figure 2.

The patient's locomotion ability (vertical red line) and its 95% confidence interval (dotted red lines) are located on the locomotion ability scale (abscissa), expressed in logits. The higher the ability of a patient the more the measure will be located to the right.

The logit is a linear unit that expresses the odds of success of the patient on any given item. The manual ability scale is centred on the average item difficulty (0 logit).

The item map lists the items from top to bottom in decreasing difficulty order. The item map shows the most probable score (0 = 'Impossible', 1 = 'Possible') to each item as a function of the patient's locomotion ability and the difficulty of the item. Note that 'Hopping on the healthy foot' is the most difficult item as it requires the highest ability to be succeeded; 'Walking less than five meters with the help of a person to support' is the easiest. Note also that the most probable score for any given item increases with the patient's locomotion ability.

The sigmoid curve shown at the bottom relates the total score on the questionnaire to the locomotion ability measure (for a complete response set). Note that the score always increases with the locomotion ability, although, given the shape of the curve, the increase is not linear. Therefore changes of locomotion ability must be interpreted in linear logit units rather than in raw scores.

The patient's response to each item is circled (missing responses are not shown). The patient should first recover easier activities like ' Walking less than five meters, indoors, holding onto pieces of furniture' up to more difficult activities like 'Going up stairs putting each foot on the next step'. The unexpected scores (circled in red in the report) may help you to diagnose an atypical behaviour of the patient or other comorbidities. For example, the item 'Hopping on the healthy foot' is scored as 'possible' while it is expected to be 'impossible', given the overall activity level measure.

The evaluation report also includes the numeric values for the patient's locomotion ability measure on the scale and the standard error of measurement (in logits). Keep those in your records to measure the patient recovery at a future occasion.