Study	Reason for exclusion
Beauchemin 1996	Allocation: randomized. Participants: patients with non‐seasonal depression. Interventions: bright (sunlight) vs dim rooms (in brightly lit rooms variability in intensity of light (both at different times of a day and on sunny/cloudy days).
Beauchemin 1997	Allocation: randomized. Participants: patients with non‐seasonal depression. Interventions: 10,000 lux vs 2,500 lux (also lower experimental level of light intensity is high and clearly active).
Benedetti 2001	Allocation: randomized. Participants: patients with non‐seasonal depression. Interventions: bright (sunlight) vs dim rooms (in brightly lit rooms variability in intensity of light (both at different times a day and on sunny/cloudy days).
Benloucif 2002	Allocation: not randomized.
Brown 2001	Allocation: randomized. Participants: women with non‐seasonal depressive symptoms. Interventions: Tri‐modal intervention (walk+outdoor light+vitamin) vs placebo vitamin.
Corral 2001	Allocation: randomized. Participants: postpartum depressives, more than 20% of the patients with seasonal depression.
Dietzel 1986	Allocation: not randomized, case‐control design.
Gordijn 1998	Allocation: not randomized, case‐control, crossover design.
Heim 1988	Allocation: randomization not stated, crossover design. Participants: patients with cyclothymic axial syndrome. Intervention: bright light vs sleep deprivation.
Kasper 1989	Allocation: balanced randomized. Participants: general population with seasonal difficulties of varying degrees.
Kripke 1981	Allocation: quasi‐randomized.
Köhler 1989	Allocation: randomization not stated. Participants: patients with seasonal depression.
Leibenluft 1995	Allocation: non‐randomized, crossover, longitudinal comparison.
Martin 2001	Allocation: randomized. Participants: nursing home patients, no clinical diagnosis of depression.
Neudorfer 1989	Allocation: randomized. Participants: patients with non‐seasonal depression. Interventions: light therapy for depressive patients with atypical symptoms vs for depressive patients with classical symptoms.
Oren 2002	Allocation: not randomized, open trial.
Pinchasov 2000	Allocation: randomized. Participants: patients with seasonal or non‐seasonal depression. Interventions: bright light vs exercise (both active treatments).
Prasko 1988a	Allocation: randomization not stated. Authors contacted, no response as yet.
Prasko 1988b	Allocation: randomization not stated. Authors contacted, no response as yet.
Reide 1994	Allocation: quasi‐randomized (alternation).
Stewart 1990	Allocation: randomization not stated. Participants: More than 20% of the patients with seasonal depression. Contrast between patients with seasonal affective disorder and patients with atypical depression.
Stinson 1990	Allocation: not randomized, open trial.
Thalén 2001	Allocation: not randomized.
Wehr 1985	Allocation: randomized. Participants: more than 20% of patients with seasonal depression.
Yerevanian 1986	Allocation: not randomized, open trial.