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Table 1 Raw score distribution and floor−/ceiling effects for the MISS; the four-item MISS; and the MISS-R scale

From: Measurement properties of the minimal insomnia symptom scale (MISS) in adolescents

 

MISS a

4-item MISS b

MISS- R a

Total sample

 N (missing %) c

2968 (1.8)

2955 (2.2)

2980 (1.4)

 Mean (SD) score

3.19 (2.3)

4.49 (3.1)

3.10 (2.3)

 Median (q1-q3) score

3 (1–5)

4 (2–6)

3 (1–4)

 Floor/ceiling, %

10.1/0.4

8.6/0.3

11.6/0.4

Younger d

 n (missing, %) c

1491 (1.8)

1491 (1.8)

1507 (0.7)

 Mean (SD) score

2.55 (2.1)

3.53 (2.8)

2.48 (2.1)

 Median (q1-q3) score

2 (1–4)

3 (1–5)

2 (1–3)

 Floor/ceiling %

15.7/0.3

13.5/0.2

17.4/0.3

Older e

 n (missing %) c

1477 (1.8)

1464 (2.7)

1473 (2.1)

 Mean (SD) score

3.83 (2.3)

5.47 (3.1)

3.72 (2.3)

 Median (q1-q3) score

4 (2–5)

5 (3–7)

3 (2–5)

 Floor/ceiling %

4.5/0.5

3.5/0.4

5.7/0.4

Females

 n (missing, %) c

1566 (0.1)

1560 (0.2)

1570 (0.1)

 Mean (SD) score

3.31 (2.2)

4.67 (3.0)

3.20 (2.2)

 Median (q1-q3) score

3 (2–5)

4 (3–6)

3 (2–4)

 Floor/ceiling %

7.3/0.3

6.1/0.3

9.1/0.4

Males

 n (missing %) c

1364 (0.2)

1357 (0.2)

1372 (0.1)

 Mean (SD) score

3.05 (2.4)

4.28 (3.2)

2.98 (2.3)

 Median (q1-q3)

3 (1–4)

4 (2–6)

3 (1–4)

 Floor/ceiling %

13.3/0.4

11.3/0.3

14.4/0.3

  1. MISS Minimal Insomnia Symptom Scale, SD Standard Deviation
  2. a Possible total score range, 0–12
  3. b Possible total score range, 0–16
  4. c Number of respondents with complete responses (percentage of responders with ≥1 missing item response)
  5. d Younger: 13–15 years old
  6. e Older: 16–17 years old