At Month 42 , much improvement was seen : 31.7 % were abstinent from opioids and not on agonist therapy ; 29.4 % were receiving opioid agonist therapy , but met no symptom criteria for current opioid dependence ; 7.5 % were using illicit opioids while on agonist therapy ; and the remaining 31.4 % were using opioids without agonist therapy .