Table 2 Quality assessment of studiesa
From: Insomnia and the risk of depression: a meta-analysis of prospective cohort studies
Study source | Selection | Comparability | Exposure | Total score | |||||
|---|---|---|---|---|---|---|---|---|---|
Representativeness of the exposed cohort | Selection of the non- exposed cohort | Ascertainment of exposure | Demonstration that outcome of interest was not present at start of study | Comparability of cohorts on the basis of the design or analysis | Assessment of outcome | Was follow-up long enough for outcomes to occur (> = 5 years) | Adequacy of follow up of cohorts (>80 %) | ||
Ford and Kamerow [9] | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 6 |
Brabbins et al. [33] | 1 | 1 | 1 | 1 | 0 | 1 | 0 | 0 | 5 |
Breslau et al. [34] | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 1 | 7 |
Chang et al. [18] | 1 | 1 | 1 | 1 | 2 | 1 | 1 | 1 | 9 |
Weissman et al. [10] | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 6 |
Foley et al. [35] | 1 | 1 | 1 | 1 | 0 | 1 | 0 | 0 | 5 |
Johnson et al. [36] | 1 | 1 | 0 | 1 | 1 | 1 | 1 | 1 | 7 |
Mallon et al. [37] | 1 | 1 | 0 | 1 | 1 | 1 | 1 | 0 | 6 |
Roberts et al. [17] | 1 | 1 | 0 | 1 | 0 | 1 | 0 | 1 | 5 |
Roberts et al. [38] | 1 | 1 | 0 | 1 | 2 | 1 | 0 | 0 | 6 |
Hein et al. [39] | 0 | 1 | 1 | 1 | 0 | 1 | 1 | 1 | 6 |
Perlis et al. [40] | 0 | 1 | 1 | 1 | 0 | 1 | 0 | 0 | 4 |
Morphy et al. [41] | 1 | 1 | 1 | 1 | 2 | 1 | 0 | 0 | 7 |
Buysse et al. [20] | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 7 |
Cho et al. [19] | 1 | 1 | 1 | 1 | 2 | 1 | 0 | 1 | 8 |
Jansson-Fröjmark and Lindblom [42] | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 1 | 7 |
Roane and Taylor [23] | 1 | 1 | 1 | 1 | 0 | 1 | 1 | 0 | 5 |
Kim et al. [21] | 1 | 1 | 1 | 1 | 2 | 1 | 0 | 0 | 7 |
Szklo-Coxe et al. [22] | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 6 |
Yokoyama et al. [43] | 1 | 1 | 1 | 1 | 2 | 1 | 0 | 0 | 7 |
Jaussent et al. [45] | 1 | 1 | 1 | 1 | 2 | 1 | 0 | 0 | 7 |
Almeida et al. [44] | 1 | 1 | 1 | 1 | 2 | 1 | 1 | 0 | 8 |
Marques et al. [46] | 0 | 1 | 0 | 1 | 1 | 1 | 0 | 0 | 4 |
Skapinakis et al. [53] | 1 | 1 | 1 | 1 | 2 | 1 | 0 | 0 | 7 |
Salo et al. [49] | 1 | 1 | 1 | 1 | 2 | 1 | 0 | 1 | 8 |
Suh et al. [54] | 1 | 1 | 1 | 1 | 2 | 1 | 1 | 1 | 9 |
Paudel et al. [52] | 1 | 1 | 1 | 1 | 2 | 1 | 0 | 0 | 7 |
Campbell et al. [50] | 1 | 1 | 1 | 1 | 2 | 1 | 1 | 1 | 9 |
Jackson et al. [55] | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 8 |
Sivertsen et al. [56] | 1 | 1 | 1 | 1 | 2 | 1 | 1 | 1 | 9 |
Okajima et al. [48] | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 6 |
Thomée et al. [47] | 0 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 5 |
Gehrman et al. [51] | 0 | 1 | 1 | 1 | 2 | 1 | 1 | 0 | 7 |
Dørheim et al. [32] | 0 | 1 | 1 | 0 | 0 | 1 | 0 | 0 | 3 |