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Table 2 The results of sub-group analyses

From: The prevalence of severe depression in Iranian older adult: a meta-analysis and meta-regression

VariablesNo. studiesPrevalence% (95% CI)I2 (%)P valueNo. participants
Geographical regionNorth46.5 (2.8–14.5%)89.50.000925
South21.8 (0.1–3.4%)96.90.0001332
East
West38.4 (5–13.9%)610.000513
Center418.7 (7.6–29.1%)970.0001178
Year of publication2000–200622.4 (0.1–54.1%)1491
2007–2010615.9 (8.2–28.6%)990.000816
> 201155.7 (3.5–9.1%)98.20.0001641
Sample size< 200614 (6.3–28.4%)99.50.000718
200–40057.9 (3.6–16.6%)96.20.0001518
> 40021.5 (0.1–20.6%) 0.0001712