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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%