Table 1 Description of the instruments
From: Test equating sleep scales: applying the Leunbach’s model
Instrument | Complete name | Number of items | Item (scale) range | Availability |
|---|---|---|---|---|
ESS [25] | Epworth Sleepiness Scale | 8 | 0–3 (0–24) | TONiC and PROMIS |
MOS [26] | Medical Outcomes Study | 6 | 0–4 (0–24) | TONiC |
NSID [22] | Neurological Sleep Index- Diurnal sleepiness | 16 | 0–3 (0–48) | TONiC |
NSIN [22] | Neurological Sleep Index- Non-restorative nocturnal sleep | 15 | 0–3 (0–45) | TONiC |
NSIF [22] | Neurological Sleep Index- Fragmented nocturnal sleep | 4 | 0–3 (0–12) | TONiC |
PSQI [27] | Pittsburgh Sleep Quality Indexa | 14 | 0–3 (0–42) | PROMIS |
PSD [28] | PROMIS-SD (Sleep Disturbance) | 27 | 0–4 (0–108) | PROMIS |
PSRI [28] | PROMIS-SRI (Sleep Related Impairment) | 16 | 0–4 (0–64) | PROMIS |