Influence analysis indicated that four individual studies ( Erogul et al., 2014 ; Hamdan-Mansour, Puskar & Bandak, 2009 ; Pachankis & Goldfried, 2010 ; Peden et al., 2001 ), if omitted, would drop the significant overall ES for the studies with 3–6 months follow-up to borderline significance.
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Effects of mental health interventions for students in higher education are sustainable over time: a systematic review and meta-analysis of randomized controlled trials.
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The sentences
Pooled ES did not reach statistical significance for follow-up periods of 13–18 months.