Table 1 Insomnia severity index items (scores of each item is 0–4; 0 = no problem or difficulty; 4 = very severe problem).

From: The simplification of the insomnia severity index and epworth sleepiness scale using machine learning models

Item no.

Question

1

Rate the current (i.e., last 2 weeks) severity of your insomnia problem(s)

1-a

Difficulty falling asleep

1-b

Difficulty staying asleep

1-c

Problems waking up too early

2

How satisfied/dissatisfied are you with your current sleep pattern?

3

To what extent do you consider your sleep problem to interfere with your daily functioning

4

How noticeable to others do you think your sleeping problem is in terms of impairing the quality of your life?

5

How worried/distressed are you about your current sleep problem?

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