Why short programs fall short
The familiar twenty-eight-day program treats addiction as a single event to be resolved and closed out. The research says otherwise. A landmark 2000 review in JAMA by McLellan and colleagues compared substance use disorder to chronic illnesses everyone already accepts as medical — type 2 diabetes, hypertension, asthma — and found the relapse rates strikingly similar: 40 to 60 percent of people treated for substance dependence return to use within a year, in the same range as relapse for those other chronic conditions.1 No one treats diabetes with one short program and then withdraws all care. Addiction has usually been treated exactly that way.
The federal government draws the practical conclusion from this. The National Institute on Drug Abuse states that treatment lasting less than 90 days is “of limited effectiveness,” and that better outcomes come with longer durations and continuing care.2 Ninety days is a floor beneath which treatment often cannot get traction — not a finish line. For a woman living it, that gap is not academic: thirty days can be enough time to get sober inside a building, and nowhere near enough time to become safe enough, outside it, to stay that way.
Why a full year
If ninety days is only a floor, what does more time actually buy? The concept researchers use to answer that is recovery capital — the social, physical, human, and cultural resources a person needs to get well and stay well: relationships, housing, income, skills, a sense of belonging.3 Studies find that the amount of recovery capital a person has predicts whether their recovery lasts4 — and none of those resources can be handed to a woman at discharge. Each has to be rebuilt, slowly, over months.
The strongest direct evidence for this comes from a randomized controlled trial of communal recovery housing, published in the American Journal of Public Health. Two years out, residents who had lived in structured sober housing had markedly better outcomes than those who received usual aftercare on every measure studied — substance use, income, and incarceration.5 A month is not enough time to rebuild a life. A year begins to be. The full evidence on treatment duration and recovery capital, with all citations, is laid out at Why a Year.
Why trauma-informed, women-specific, and residential
Everything above holds for anyone. But for most women, the addiction or crisis did not appear on its own — it grew out of something earlier. The Adverse Childhood Experiences Study, a survey of more than 9,500 adults published in 1998 by Felitti, Anda, and colleagues, found a strong, graded relationship between childhood abuse and household dysfunction and adult risk of addiction, depression, and suicide.6 Treating the addiction while leaving that underlying wound unaddressed is now understood across the field as a setup for relapse.
That is why federal guidance does not treat “trauma-informed” and “women-specific” as extras. SAMHSA's clinical guidance for women's treatment (TIP 51) calls for care that is relational, integrates trauma treatment with the clinical work, and wraps housing, childcare, and health support around a woman rather than scattering them across separate agencies she must reach on her own.7 A residential setting is what makes that wraparound possible — and stability of place, itself, is part of what has to be rebuilt before anything else can hold.
Honest about the limits
No single study proves the number “twelve months.” No randomized trial has tested one year against other lengths and declared it the winner. What the evidence supports is a pattern, not a verdict: longer time in care predicts better outcomes, ninety days functions as a minimum rather than a target, and the resources that sustain recovery take many months to rebuild. Much of this research is observational, showing relationships rather than proof of a single cause — a distinction worth stating plainly rather than glossing over.
What survives that honesty is a convergence. Independent lines of research — chronic-illness medicine, recovery capital, the ACE studies, trauma-informed and gender-responsive care — point the same direction. A year is a reasoned response to the weight of that evidence, not a figure any one trial has validated.
One more limit deserves to be stated plainly rather than left implied: every study above is field research on a type of program — long-term, trauma-informed, residential care — not a study of Mercy Manor itself. Mercy Manor has not yet opened and has no outcomes data of its own yet. What this page cites is evidence for the model; the women who go through Mercy Manor's doors will be the first data the program itself produces, and we intend to report it honestly as it comes in.
