In addition, we must also consider that a relatively small intervention (2 days of professional development) over a relatively long intervention time (6 months) will likely also introduce various uncontrolled effects in the environment.
This is particularly suggested in case of large displacement, long trauma to intervention time (15 days or more) or poor bone quality.
While the first focus is autism, with the aim of trying to shrink intervention times to improve long term outcomes for children — given what Vaughan describes as a "well-documented" link between earlier intervention and better autism outcomes — the intent is to address other behavioral conditions too, in time, such as ADHD.
Moreover, as with many other public health interventions, the long time frame between intervention and effect is a major barrier to assessing the long term effectiveness of interventions, although judicious use of modelling may help at least to look at potential cost effectiveness of interventions if different levels of effect are achieved.
The optimal interval from failure to intervention (hereafter 'failure-to-intervention-time') is not well defined, as only a small number of studies have assessed the impact of failure-to-intervention-time on short- and long-term patency rates.
In reviewing the medical literature, Boucek found the longest recorded time that a heart had ever stopped and then spontaneously restarted without medical intervention was 65 seconds.
The design with a long follow-up time, large intervention and control groups with reasonable sample attrition may be considered to be among the strengths of this study.
The challenges of sustaining preventive interventions over the long time periods necessary for primary prevention of cancer have been thoroughly described by Zelen (1988).
Bakermans-Kranenburg et al [ 23] stress the need for long-term follow-up studies, since sleeper effects – effects that emerge a long time after the intervention – on for example attachment security might otherwise remain undetected.
Praising the plan's expanded focus to ensure that polio eradication efforts – which reach the world's most vulnerable children – support broader health interventions, long-time donors Canada, Germany, Norway and the UK, as well as Nigeria announced new commitments to support the plan's long-term objectives.
