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Child and Adolescent Mental Health 24, 242–250; randomised parent-session allocation, primary remission and follow-up.

No longer meeting a specified diagnostic criterion at a stated assessment. Remission of the principal diagnosis, remission of every anxiety disorder, global improvement and symptom-score change must be reported separately.

Parents should have a negotiated, formulation-led role that helps an adolescent undertake effective treatment while supporting increasing autonomy. Three roles must be distinguished: facilitating access and practice, changing parental responses that maintain avoidance, and receiving treatment for the parent's own difficulties. A parent being present in more sessions is not a mechanism in itself. The relevant question is which parental action changes which maintaining process, for which adolescent, beyond the effects of adolescent treatment alone.

Initial assessment should obtain both the young person's and caregiver's perspectives on feared situations, avoidance, impairment and family responses. Separate discussion with the adolescent can reveal difficulties they would not disclose in a joint meeting. A shared formulation can then identify whether parents provide repeated reassurance, take over social interactions or organise routines around avoidance. Accommodation can bring immediate relief while reducing opportunities for the adolescent to learn that uncertainty and distress are manageable. Support can instead combine recognition of distress with confidence in the young person's capacity to approach an agreed activity. These descriptions concern potentially modifiable interactions, rather than assigning parental blame for the disorder's origin.

The role should fit developmental circumstances. A thirteen-year-old dependent on a caregiver for transport may need different practical support from a seventeen-year-old arranging appointments. Parents can help implement between-session practice, notice approach rather than merely the disappearance of distress, and support school coordination. The adolescent should help decide what information is shared and which sessions are joint, within clearly explained confidentiality and safeguarding arrangements. Parent involvement can undermine treatment if it becomes surveillance, coercion or another route for excessive reassurance. Fathers, other caregivers and relevant family relationships should be considered rather than assuming that the mother is always the appropriate participant.

Adolescent-specific evidence does not support mandatory additional parent sessions for everyone. Polly Waite and colleagues randomised sixty thirteen- to eighteen-year-olds in routine services to immediate or delayed Internet CBT, with an additional random allocation of parent sessions. The parent addition did not significantly improve remission, either immediately or at follow-up, and the online programme itself did not clearly outperform waiting list on the primary remission endpoint. Confidence intervals were wide. This is evidence against assuming a reliable benefit from that particular addition, rather than proof that parental involvement is useless or that a modest targeted effect is impossible.^[ref]

Evidence from younger samples suggests hypotheses about selection. Vanessa E. Cobham and colleagues stratified families by parental anxiety before randomising sixty-seven seven- to fourteen-year-olds to child CBT with or without parental anxiety management. Their findings suggested greater benefit of the addition when a parent was anxious, but results varied across measures. The study motivates a moderator hypothesis; its small subgroups and younger participants limit a general rule for adolescent treatment.^[ref]

A larger test cautions against treating a plausible family risk factor as an established augmentation target. Cathy Creswell and colleagues studied 211 children whose mothers also had anxiety disorders. All received child CBT; additions targeted either maternal anxiety or mother–child interaction, with nonspecific contact balanced. The additions changed some maternal outcomes but did not clearly improve the primary child diagnostic outcome. Treating a parent's anxiety may be worthwhile for that parent without necessarily producing an incremental child-treatment effect. Family-risk association, target engagement and improvement in the child's disorder are separate evidential steps.^[ref]

An alternative is parent-based treatment rather than parental augmentation of child therapy. Eli R. Lebowitz and colleagues randomised 124 seven- to fourteen-year-olds to child CBT or SPACE treatment, a parent intervention reducing accommodation without direct child–therapist sessions. SPACE treatment met prespecified noninferiority criteria for anxiety outcomes and reduced accommodation. This supports the possibility that changing caregiver responses can be an effective delivery route. It does not establish that replacing adolescent-focused therapy with parent work is appropriate across the older teenage years, or that the same approach is preferred by every young person.^[ref]

Together, these studies favour flexible involvement. A useful clinical formulation can identify practical support needs, accommodation that interferes with learning, and parental anxiety requiring its own assessment. However, personalised selection rules remain hypotheses unless prospectively tested. Neither a null augmentation trial nor a successful parent-only trial settles the optimal dose of parent contact alongside a given adolescent therapy. Treatment fidelity also matters: a nominally parent-inclusive programme may differ greatly in whether it rehearses supportive responses, changes accommodation or merely provides information.

A future study should therefore recruit adolescents with diagnosed anxiety across routine services and deliver the same adequate adolescent CBT in every arm. Randomise caregivers to a brief accommodation-focused module or a credible contact-matched education condition; an additional prespecified stratum could examine parents with their own anxiety disorder. Measure accommodation and parental anxiety before allocation, and power the study for the specific treatment-by-baseline-characteristic interactions rather than searching retrospectively for successful subgroups. Include age, caregiver availability and adolescent preference in recruitment and reporting without treating chronological age as a complete measure of autonomy.

Masked diagnostic interviews, young-person-rated impairment and school or social functioning should be assessed after treatment and at six and twelve months. Parent reports should be retained as a separate perspective, not substituted for adolescent outcomes. Record what parents actually do through agreed observations or structured practice tasks, alongside session attendance and treatment fidelity. Measure changes in accommodation repeatedly before the proposed downstream improvement. Temporal mediation would constrain a mechanism, although additional mediator–outcome assumptions would still be needed for a causal mediation claim.

The trial should also measure family burden, acceptability and any deterioration in relationships, and examine families unable to attend conventional sessions. An approach that improves completer outcomes while excluding caregivers with work or language barriers may reduce practical access. Qualitative interviews can explain why a module helps or fails, while the randomised contrast estimates its incremental effect. The 2022 evidence supports parents as potential partners, change agents and recipients of care, but supports a collaboratively chosen and testable role more strongly than indiscriminate intensification of parental attendance.

Improving access means increasing the proportion of children who receive an effective, acceptable intervention in time, not simply increasing referrals or distributing an app. The pathway includes recognition, deciding that help is needed, finding a service, starting treatment, receiving its active content and obtaining further care when it is insufficient. Parents can influence every stage, while schools and services determine whether practical barriers make that influence effective. Access and clinical benefit should therefore be evaluated together.

Tessa Reardon and colleagues interviewed parents of sixteen seven- to eleven-year-olds identified through schools as having anxiety disorders. The qualitative accounts distinguished recognising a problem, recognising the need for help, contacting professionals and receiving support. This is useful evidence about the pathway and barriers experienced by families. It is not a population estimate of how often each barrier occurs, nor a trial showing that a particular information campaign increases recovery.^[ref]

Recognition can be supported by concrete descriptions of avoidance and impairment rather than assuming caregivers know diagnostic terminology. School and primary-care routes can offer an initial assessment and an explanation of available options. Information alone, however, cannot remove an inaccessible appointment time, transport cost or long waiting list. Services should provide clear referral instructions, choices of contact mode and a way to ask questions without requiring a caregiver to become an expert navigator. Children whose parents cannot participate still need a route to care.

Guided parent-delivered CBT is one approach to increasing treatment capacity. Kerstin Thirlwall and colleagues randomised 194 children to fuller parent guidance, briefer guidance or waiting list. The fuller programme involved four face-to-face and four telephone contacts; the brief version used two of each. Reported recovery from the principal diagnosis was 50%, 39% and 25%, respectively, with clear evidence for the fuller version against waiting list but greater uncertainty for the brief version. Eligibility excluded a current anxiety disorder in the primary caregiver, limiting direct extrapolation to families who may themselves need support.^[ref]

The mechanism is not simply giving parents a manual. Guidance can help caregivers identify avoidance, plan manageable approach practice and alter accommodation while receiving feedback from a therapist. This can reduce specialist time spent directly with each child, but shifts some work onto families. Literacy, language, working hours, confidence and the caregiver's own mental health may affect participation. Flexible guidance and practical assistance should be built into delivery rather than interpreting failure to complete as parental unwillingness.

Routine-service evidence is important because research-clinic efficacy does not settle implementation. Cathy Creswell and colleagues randomised 136 five- to twelve-year-olds in four NHS services to brief Guided parent-delivered CBT or solution-focused brief therapy. The trial did not establish a clear difference on global clinical improvement, and the economic analysis suggested a possible efficiency advantage with uncertainty. The improvement endpoint should not be relabelled diagnostic remission; nor does a nonsignificant superiority result prove equivalence. The study nevertheless directly addresses a real service choice between active interventions.^[ref]

Digital delivery offers another route, with limits. Maral Jolstedt and colleagues compared therapist-guided Internet CBT with online child-directed play in 131 eight- to twelve-year-olds. Both conditions involved twelve modules and therapist contact. CBT improved the principal anxiety diagnosis more often, with 48% versus 15% no longer meeting that diagnosis at the assessed endpoint. This supports a guided programme with active clinical content and a credible comparator, not the effectiveness of every freely available anxiety app or the elimination of therapist input.^[ref]

Results should not be assumed to generalise across ages and programmes. Waite and colleagues did not establish clear remission benefits for their routine-service adolescent online programme or its extra parent sessions. Nordh and colleagues found benefits for a different, disorder-specific internet programme for youth social anxiety against active support. These findings favour evaluating a specified treatment and delivery system, rather than treating the internet itself as the active ingredient.^{[ref] [ref]}

Parent-only treatment is also distinct from parent-guided child treatment. Lebowitz and colleagues' SPACE treatment trial showed that changing parental accommodation could provide an effective route in a seven- to fourteen-year-old sample without direct child–therapist treatment sessions. It expands the range of possible offers, but does not justify making parental participation the sole gateway for every older adolescent or assuming the same evidence covers all family circumstances.^[ref]

A sensible service model would offer supported, lower-intensity care where appropriate, measure progress and provide timely escalation when improvement is inadequate. Assessment should identify complexity or urgent need that requires a different pathway immediately. Follow-up should include families who discontinue, because apparently good outcomes among completers can conceal exclusion. Remote and in-person options, interpreters, accessible materials and attention to digital privacy can widen participation; access should also be checked among families without reliable devices or private space.

Parents can support referral, appointments and between-session practice, but the child's perspective remains essential. Parent and child reports may differ, particularly for internal fears. For adolescents, involve caregivers in a negotiated way that respects autonomy and explains confidentiality. Supportive accommodation reduction should not remove disability-related adjustments or expose the child to genuine danger. An access intervention that increases coercion or burden may look efficient while reducing acceptability and sustained engagement.

A future implementation trial could randomise schools or primary-care networks to an accessible parent-guided pathway with direct supported referral, versus the existing referral pathway. Cluster allocation can reduce contamination when staff change their practices across a whole site. Both pathways should provide appropriate assessment and escalation. Prespecify the eligible population, measure how many are offered help, start, receive the intended content and improve, and analyse outcomes using the cluster structure rather than treating every child as independently allocated.

The main service endpoint should combine reach with clinically meaningful outcome, accompanied by masked diagnostic follow-up and everyday functioning. Report waiting time, therapist resource use, family time, dropout and six- or twelve-month outcomes. Examine inequalities by deprivation, language, caregiver anxiety and digital access using prespecified comparisons. A programme that reduces therapist hours but transfers an unmanageable burden to parents has not necessarily improved access. The 2022 evidence supports guided parental involvement and selected digital treatments as useful routes, embedded within assessment, support and escalation rather than offered as universal substitutes for care.

A psychological treatment has a specific effect only relative to a clearly defined alternative explanation. Benefit beyond waiting is different from benefit beyond credible therapeutic contact, and both differ from evidence that a named technique works through its proposed mechanism. No single research design establishes all three. A persuasive programme combines controlled clinical comparisons with component and process experiments, while keeping patient-relevant outcomes central.

An uncontrolled before-and-after study cannot isolate a treatment effect. People may enter care when symptoms are unusually severe, creating regression toward their longer-term level; difficulties can improve naturally; expectations, concurrent care and repeated assessment can also change outcomes. A waiting-list randomised trial controls some time-related explanations but adds unequal expectations and contact. It can establish benefit from being offered the treatment package compared with waiting under those conditions, without identifying which ingredient produced the difference.

For specificity beyond nonspecific therapy effects, use a randomised comparison with a credible active intervention. Match time, attention, therapist competence and assessment opportunities as far as the question permits. Measure credibility and expected benefit rather than assuming equivalence from similar session counts. Keep relevant usual care available in both arms. Allocation concealment prevents recruitment decisions from anticipating the next assignment, while blinded independent outcome assessment reduces a different source of bias after allocation. Therapists and patients usually cannot be fully blinded to psychological procedures.

Daniel Freeman and colleagues' Feeling Safe trial illustrates this stronger package comparison. Patients with persistent persecutory delusions received the programme or befriending delivered by the same therapists, alongside usual care. At six months, the primary continuous conviction measure favoured Feeling Safe. This supports an effect beyond the particular befriending comparator, but does not establish that each module is necessary or that the whole benefit travelled through one nominated mediator.^[ref]

The comparator should be interpreted fairly. A weak or implausible control can exaggerate apparent specificity, while an active comparator may itself change the proposed mechanism. If befriending improves social confidence, it is not a biologically inert placebo. A null result may mean two useful treatments have similar effects, both are ineffective, or the study is too imprecise. Failure of a superiority test does not demonstrate equivalence; an equivalence or noninferiority question requires prespecified clinically justified margins and appropriate precision.

A dismantling trial varies a specified component while keeping the surrounding treatment adequate and similar. For example, compare the same exposure programme with and without a safety behavior intervention. This estimates a conditional contribution: absence of an additional benefit does not imply that the component is useless in every context, because another part may produce similar learning. A factorial design can independently vary an action and its explanatory rationale, estimating their effects and interaction when the study has adequate power.

The early panic safety behavior experiment provides both an example and a caution. Greater change after brief exposure with precautions reduced supports the combined manipulation. Yet behavioral instructions and the explanation of the exercise were not fully separated. The appropriate next test would vary those elements independently and check actual behavior and expectancy change. Simply renaming the conditions 'cognitive' and 'behavioral' would not remove the confounding.^[ref]

A mechanistic experiment can provide more direct leverage than a full treatment comparison. Colin MacLeod and colleagues trained attentional bias using a modified dot-probe task and tested later responses to stress. This asked whether experimentally changing information processing altered emotional vulnerability. It remains necessary to establish that the manipulation engaged the intended process rather than only a task-specific strategy, and that any effect transfers to the clinical phenomenon of interest. Laboratory emotional vulnerability is not itself diagnostic remission.^[ref]

Likewise, Daniel Freeman and colleagues used virtual social environments to compare exposure against threat testing with safety behavior reduction. Both groups encountered graded situations, making the content of learning more directly investigable than in a therapy-versus-waiting comparison. The combined manipulation and brief follow-up constrain the mechanism claim. A useful manipulation check, an independent behavioral outcome and later transfer assessment strengthen the design more than a treatment label does.^[ref]

Mediation analysis is informative but insufficient on its own. Randomising treatment identifies the total effect of assignment under the trial's assumptions; it does not automatically randomise the mediator. Symptom improvement could change reported beliefs, or an unmeasured process could influence both the belief score and the outcome. Measure the proposed mediator before the downstream outcome, assess competing pathways and perform sensitivity analyses. Replication using a different way to alter the same process can provide converging evidence; stronger identification may require experimental manipulation of that process itself.

Clinical trials also need suitable sampling, prespecified outcomes, adequate power, intention-to-treat analysis and transparent missing data handling. Outcomes should include functioning and possible deterioration, with follow-up long enough to distinguish transient reassurance from durable benefit. Treatment fidelity and competence must be assessed in both arms. Therapist allegiance, clustering of patients within therapists and differential dropout can affect interpretation. Statistical significance alone does not establish a meaningful improvement, especially when many outcomes or subgroup comparisons are explored.

Pragmatic implementation trials answer a complementary question: does the intervention add benefit in ordinary care, at acceptable cost and burden? Jaime Delgadillo and colleagues' therapist-cluster trial tested an automated feedback system linked to supervisory review within routine services. Its comparison isolates the added feedback arrangement more closely than an observational association between high-performing services and monitoring. It still tests a specified package of information and response, rather than an abstract effect of measurement divorced from clinical action.^[ref]

The strongest conclusion consequently states its level of specificity. A well-conducted active control trial can establish an incremental treatment-package effect. A dismantling or factorial trial can identify a component's contribution within a defined context. An experimental process manipulation, supported by temporally ordered measurements and converging clinical evidence, can constrain the mechanism. Keeping these claims separate prevents a successful therapy from being treated as proof of its entire theory, while preserving the practical importance of improvements patients actually experience.

An explanation of a difficulty, its proposed maintaining processes and the rationale for intervention. Understanding can support informed participation, but knowledge gained from an explanation is not itself proof of symptom remission.

A change score scaled by its expected measurement error. With equal marginal standard deviation $s$, reliability $r$ and independent measurement errors at the two assessments, the difference has error standard deviation $s\sqrt{2(1-r)}$, givingA conventional normal-error criterion compares its magnitude with 1.96. The assumptions and instrument-specific reliability matter; reliable change is not itself diagnostic remission or proof that treatment caused the change.

A service outcome combining a reliable improvement criterion with movement from baseline caseness below the relevant clinical cutoffs. The instruments and denominator must be specified; this is not automatically remission established by diagnostic interview.

Psychological intervention for anxiety disorders in children and adolescents. Treatment studies should distinguish diagnostic remission, symptom change, global improvement and everyday functioning, as well as immediate outcomes and maintenance. A successful multicomponent intervention establishes an effect of that package under the tested conditions, not the necessity of each included technique.