The net intervention effect following an intervention in a population is the difference between the changes observed in the intervention and comparison (control) groups relative to the respective baseline levels.
If both intervention and control groups are available:
net intervention effect =
= (((number in intervention group after intervention) - (number in intervention group before intervention)) / (number in intervention group before intervention)) - (((number in control group after intervention) - (number in control group before intervention)) / (number in control group before intervention))
If no control group is available:
net intervention effect =
(((number in intervention group after intervention) - (number in intervention group before intervention)) / (number in intervention group before intervention))
If no baseline (prior to intervention) data is available:
net intervention effect =
= ((number in intervention group after intervention) - (number in control group after intervention)) / (number in control group after intervention))
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