Bright light therapy v placebo for mood disorders at 6–42 days*
| Therapy | Diagnosis | Number of trials (n) | Standardised mean difference (95% CI) |
|---|---|---|---|
| *CI defined in glossary. Differences >0 favour treatment. | |||
| Bright light | Seasonal affective disorder | 8 (360) | 0.84 (0.60 to 1.08) |
| Non-seasonal depression | 3 (127) | 0.53 (0.18 to 0.89) | |
| Adjunctive bright light | Non-seasonal depression | 5 (135) | −0.01 (−0.36 to 0.34) |
| Dawn simulation | Seasonal affective | 5 (133) | 0.73 (0.37 to 1.08) |