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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 %