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Table 1 Weekly average scores (+ SD)

From: The effects of low-intensity narrow-band blue-light treatment compared to bright white-light treatment in sub-syndromal seasonal affective disorder

Instrument (range)

Condition

N

Day1 (SD)

Day 8 (SD)

Day 15 (SD)

Effect Size d

% Decrease

Responder N (in %)

SIGH-SAD (0-75)

BLT

22

15.5 (2.4)

7.7 (5.1)

7.0 (6.5)

1.7

54.8

13 (59)

 

BLUE

26

16.3 (2.6)

9.1 (5.6)

8.1 (5.6)

1.9

50.7

16 (61.5)

HRSD (0-52)

BLT

22

6.5 (2.2)

3.0 (2.3)

3.0 (4.0)

1.1

53.8

13 (59)

 

BLUE

26

6.5 (2.5)

3.8 (2.8)

3.2 (2.8)

1.2

50.7

17 (65)

ATYP (0-23)

BLT

22

9.0 (2.7)

4.7 (3.5)

4.0 (3.9)

1.5

55.6

15 (68)

 

BLUE

26

9.8 (2.5)

5.3 (3.5)

4.9 (3.7)

1.6

50.0

14 (54)

BDI-II (0-63)

BLT

22

15.0 (4.3)

9.1 (5.1)

7.5 (5.8)

1.5

50.0

11 (50)

 

BLUE

26

13.9 (4.8)

9.4 (5.7)

9.7 (7.5)

0.7

30.2

9 (35)

SFQ (4-28)

BLT

22

18.7 (3.3)

15.7 (3.9)

15.5 (3.5)

0.9

24.1

4 (18.1)

 

BLUE

26

18.2 (3.4)

15.1 (3.5)

15.5 (4.1)

0.7

21.5

5 (19.2)

  1. Cohen’s d effect size and response percentage from day 1 to day 15, as rated by the scale adapted for seasonal symptoms SIGH-SAD (24 items), the Hamilton Rating Scale for depression (HRSD, 17 items), and the atypical symptoms ATYP (7 items), the score on the Beck Depression Inventory-II (BDI-II) and the Short Fatigue Questionnaire (SFQ) for each condition. BLT = bright white light treatment; BLUE = narrow-band blue-light treatment. Responder = subject with an improvement of at least 50 %