"Imperfect data can be because of obliviousness or instability'? What does this mean and can you provide an example of this in healthcare?

"Imperfect  data can be because of obliviousness or instability'? What does this mean and can you provide an example of this in healthcare?

Imperfect data in many instances result from instability and obliviousness. This statement meansthat healthcare often faces unreliable and untimely data, inaccurate and data which can be used for...