Table 1.

Two-item version of the Sleep Condition Indicator (SCI-02)

	Score

Item^a	4	3	2	1	0

*Thinking about the past month, to what extent has poor sleep …*
1. … troubled you in general	Not at all	A little	Somewhat	Much	Very much
*Thinking about a typical night in the last month …*
2. … how many nights a week do you have a problem with your sleep?	0–1	2	3	4	5–7

↵a Scoring instructions: Add the item scores to obtain the SCI total (minimum 0, maximum 8). A higher score means better sleep.