Sylwer fod y cymhwysiad hwn dan ddatblygiad. Os ydych chi'n gweld unrhyw gamgymeriadau neu os nad yw rhywbeth yn gweithio, cysylltwch â ni yn evidence.service@wales.nhs.uk.
Adolygiad Systematig
Mae'r awduron yn datgan. "To assess the effectiveness of mass media campaigns in preventing or reducing the use of or intention to use illicit drugs amongst young people."
Mae'r awduron yn datgan. "We included 23 studies involving 188,934 young people, conducted in the USA, Canada and Australia between 1991 and 2012. Twelve studies were randomised controlled trials (RCT), two were prospective cohort studies (PCS), one study was both a RCT and a PCS, six were interrupted time series and two were controlled before and after (CBA) studies. The RCTs had an overall low risk of bias, along with the ITS (apart from the dimension 'formal test of trend'), and the PCS had overall good quality, apart from the description of loss to follow‐up by exposure. Self reported or biomarker‐assessed illicit drug use was measured with an array of published and unpublished scales making comparisons difficult. Pooled results of five RCTs (N = 5470) show no effect of media campaign intervention (standardised mean difference (SMD) ‐0.02; 95% confidence interval (CI) ‐0.15 to 0.12). We also pooled five ITS studies (N = 26,405) focusing specifically on methamphetamine use. Out of four pooled estimates (two endpoints measured in two age groups), there was evidence of a reduction only in past‐year prevalence of methamphetamine use among 12 to 17 years old. A further five studies (designs = one RCT with PCS, two PCS, two ITS, one CBA, N = 151,508), which could not be included in meta‐analyses, reported a drug use outcome with varied results including a clear iatrogenic effect in one case and reduction of use in another."
Mae'r awduron yn datgan. "Overall the available evidence does not allow conclusions about the effect of media campaigns on illicit drug use among young people. We conclude that further studies are needed."