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Table 1 Weekly average depression scores (±SD)

From: Low-intensity blue-enriched white light (750 lux) and standard bright light (10 000 lux) are equally effective in treating SAD. A randomized controlled study

Condition

N

Day 1 (SD)

Day 8 (SD)

Day 15 (SD)

Day 22 (SD)

Effect size d

% Response

Responder N

SIGH-SAD

SLT

11

25.6 (6.3)

18.1 (8.0)

10.9 (4.4)

8.9 (6.8)

2.54

65.2

8

 

BLT

11

25.4 (6.9)

19 (6.0)

14 (10.1)

6 (4.0)

3.53

76.4

11

HRSD

SLT

11

13.8 (4.6)

9.9 (4.3)

6.8 (3.0)

4.9 (3.9)

2.09

64.5

9

 

BLT

11

13,7 (5.4)

10,45(3.3)

7.8 (4,9)

3.4 (2.0)

2.53

75.2

10

ATYP

SLT

11

11.8 (4.6)

8.2 (4.3)

4 (2.2)

4 (3.5)

1.91

66.1

8

 

BLT

11

11.6 (3.5)

8.5 (4.3)

6.2 (5.8)

2.6 (2.5)

2.96

77.6

10

BDI-II

SLT

11

23 (5.3)

15.3 (8.1)

9.1 (6.4)

7.1 (6.4)

2.71

69.1

9

 

BLT

11

26.6 (10.8)

17.8 (11.7)

14.9 (11.4)

5.3 (3.8)

2.63

80.1

10

SFQ

SLT

11

24.6 (2.0)

20.5 (7.0)

16.5 (6.0)

14.2 (5.5)

2.51

42.3

4

 

BLT

11

25.2 (2.8)

20.2 (6.2)

18.5 (7.5)

11 (4.5)

3.79

56.3

8

  1. Cohen's d effect size and response percentage from day 1 to day 22, as rated by the Hamilton Rating Scale for Depression (HRSD, 17 items), the scale that has been adapted for seasonal symptoms SIGH-SAD (24 items), and the atypical symptoms separately ATYP (7 items), the score on the Beck Depression Inventory-II and the Short Fatigue Questionnaire for each condition. SLT = standard light treatment; BLT= blue-enriched white-light treatment
  2. Responder = subject with an improvement of at least 50%