Feasibility and reliability of Whistler pulmonary function testing in adults with an intellectual disability.

Currently spirometry is used as the *gold standard* for the diagnosis of
obstructive pulmonary diseases. Tidal breathing pulmonary function measurements
are more feasible and practical in people with intellectual disability.
Interrupter technique (Rint) is such a measurement which tests airway
resistance during tidal breathing, and can be used as an alternative for
spirometry. Rint measurements may be obtained by portable equipment (the
Whistler) and is effort-independent, non-invasive and requires minimal subject
co-operation.

Is pulmonary function testing using the Whistler device a feasible method in
adults with an intellectual disability? Is pulmonary function testing using the
Whistler device a reliable method in adults with an intellectual disability?
Does the feasibility and reliability of pulmonary function testing using the
Whistler device differ between adults with a mild or moderate intellectual
disability?

A multicenter observational study to determine the feasibility and the
reliability of Whistler in people with an intellectual disability. There will
be a single measuring moment.

Because of the absence of a suitable device to measure lung function in people
with intellectual disability, this group may be at risk to under diagnosis and
therefore under treatment. The test with the Whistler device is performed
quickly and is not associated with any considerable risks or adverse events.
The burden placed upon participants is considered minimal.