A lack of clear definitions of levels of security within psychiatric services has led to significant variation in purpose and characteristics of low and medium secure units throughout the UK. This problem is compounded by a paucity of reliable, valid tools suitable to assess an individual's security needs and match these to an appropriate unit. This study aims to assess the needs of patients within a new and developing medium secure unit in order to ensure that patients are appropriately placed and to guide future development of forensic services.

Medium secure units emerged throughout the UK in the 1980s following the Glancy and Butler reports. ^{1-Reference Office3} These units generally manage patients discharged from special hospitals (hospitals which treat psychiatric patients in high security because of their potential risk to others) or those transferred from prisons and courts. There is a wide variation between medium secure units across the UK, for example in the level of physical security provided. There is a similar variation in purpose and characteristics of the next step down in security, the low secure unit, which generally provides longer-term rehabilitation for chronically disturbed patients. As a result of this variation in standards and the large numbers of delayed transfers, published needs assessments have illustrated a considerable degree of inappropriate placement within the overall system. ^{Reference Beer4} For example, Shaw et al ^{Reference Kennedy5} found that 79% of patients in secure care in a sampled UK health region were placed at a level of security that was inappropriate to their needs.

Other problems have been noted with the current provision of low and medium secure units across the UK. Turner & Salter ^{Reference Shaw, Davies and Morey6} highlight that beds in medium secure units are logjammed and that disputes over responsibilities and the appropriate use of resources have led to strained relations between forensic and general adult psychiatrists. They propose large-scale expansion of low secure facilities in order to address these problems. Pereira et al ^{Reference Turner and Salter7} suggest that a lack of low secure provision may contribute to the significant problem of delayed discharges in psychiatric intensive care units. There is also a concern that some patients may be detained in excessive security because of a lack of availability of the right treatment in lower secure provision, such as appropriate psychological treatment.

Northern Ireland has a developing regional network of forensic mental health services. Its first medium secure unit, Shannon Clinic, opened in 2005, and caters for up to 34 patients across three wards. Ward 1 provides assessment and intensive care, Ward 2 offers intermediate care and has a dedicated female area, and Ward 3 provides ongoing rehabilitation. The clinic aims to treat individuals for up to 2 years.

The aims of the study were to determine the security needs of all patients resident in medium security in Northern Ireland and the level of security these patients need. It aims to identify any aspects of security that are particularly important in this group of patients and to assess how many of these individuals require longer-term secure care. Using the findings in respect of security need, the study considers the implications for the future development of forensic services at all levels of security throughout the UK.

Method

Several complex areas have to be addressed in defining a patient's individual needs for security. In order to assess the security needs of patients in Shannon Clinic, the Security Needs Assessment Profile (SNAP) ^{Reference Pereira, Sarsam, Bhui and Paton8} was used. This tool provides a systematic framework to examine individual patient security need across open, low, medium and high secure forensic mental health services.

The SNAP examines the three traditional dimensions of security: physical, procedural and relational. Each dimension is subdivided into a number of items, with 22 items overall. The four physical security items are: perimeter, internal security, entry and facilities. The 14 procedural security items are: nursing intensity, environment, searching, access to potential weapons and fire-setting materials, internal movement, leave, external communications, visitors, visiting children, media exposure, and access to illicit substances, alcohol, pornography and information technology. The four relational skills items are: management of violence and aggression, relational nursing skills, response to nursing interventions and treatment programme, and security intelligence and police liaison. Each item is described on a four-point ordinal scale, with 0 the absence of security need and 3 representing the highest level. Each item is rated in relation to the current needs and risk profile of the patient and the security necessary to manage the risk that the patient poses to self or others.

The SNAP has been validated by its authors, ^{Reference Pereira, Sarsam, Bhui and Paton8} providing mean overall scores for open, low, medium and high secure best placement. The mean score for an open ward is 15.11, for low security 26.19, for medium security 32.39 and for high security 49.75. These mean scores can be used as rough indicators of the scores required for each level of security, as an aid to clinical judgement.

To assess the security needs of patients in Shannon Clinic, individual meetings with each patient's responsible medical officer (RMO) took place over the course of 1 week. Each patient was rated jointly on the SNAP by the researcher and the RMO; one RMO's patients were also jointly rated with other members of the multidisciplinary team. Basic patient characteristics were obtained, including age, gender, date of admission and diagnosis. Each RMO was asked to give their clinical opinion as to the appropriate level of security in which the patient could be managed. They were also asked to estimate the likely further length of stay at the appropriate level of secure psychiatric care. This opinion was based mainly on the patient's stability, insight and risk assessment. Data were analysed using Microsoft Excel on Windows (Microsoft Office XP).

Results

SNAP scores

The overall total SNAP scores ranged from 14 to 47 (mean 30.3) (Fig. 1). Four patients (12%) had SNAP total scores closest to the mean score for an open ward. Ten patients (30%) had a SNAP total score closest to the mean score for a low secure ward. Fifteen patients (45%) scored closest to the mean score for medium security and four (12%) scored closest to the mean score for high security. The SNAP has not been validated as an actuarial score that determines the level of security required, but these scores could be used as an aid to clinical decision-making. It is notable that the number of patients allocated to each level of security using these mean scores is similar to the numbers obtained using the RMO clinical opinion.

Fig 1 SNAP overall total scores for each patient, in ascending order, with means for each security level.^a SNAP, Security Needs Assessment Profile. a. SNAP means were taken from Collins & Davies ^{Reference Pereira, Sarsam, Bhui and Paton8} and rounded up to the nearest whole number.

The mean overall total scores were calculated for each ward, along with standard deviations and 95% confidence intervals (Table 1). There was a significant range of scores in all three wards, with considerable overlap between the wards.

Table 1 Mean SNAP overall total scores across the three wards

	Mean (s.d.)	95% CI
Ward 1	34.2 (8.6)	29.5–38.9
Ward 2	31.4 (8.1)	26.4–36.4
Ward 3	24.2 (4.4)	21.5–26.9

A one-way ANOVA was conducted to compare the overall total SNAP scores between the three wards. There was a significant difference between overall SNAP scores at the P<0.05 level (F(2, 30) = 5.22, P = 0.01). There is a statistically significant decline in security need of patients from Ward 1 to Ward 3. Ward 3 contains patients with significantly lower security needs, who could potentially be managed in a low secure environment.

Mean scores were calculated for each item of the SNAP, displayed in descending order in Table 2. This highlights that particular areas of security need for these patients included high relational nursing skills, engagement with treatment, restricted access to alcohol and illicit drugs, restrictions on periods of leave and robust physical security.

Table 2 Mean scores for each item of the SNAP

Itema		Average score
16	Access to alcohol	2.4
20	Relational nursing skills	2.0
21	Response to nursing interventions and treatment programme	2.0
10	Leave	1.6
15	Access to illicit substances	1.6
19	Management of violence and aggression	1.6
3	Entry	1.5
4	Facilities	1.5
12	Visitors	1.5
13	Visiting children	1.5
1	Perimeter	1.4
6	Environment	1.4
9	Internal movement	1.4
2	Internal security	1.3
8	Access to potential weapons and fire-setting materials	1.3
5	Nursing intensity	1.1
17	Access to pornographic materials	1.1
7	Searching	1.0
18	Access to information technology equipment	0.9
11	External communications	0.8
14	Media exposure	0.7
22	Security intelligence/police liaison requirements	0.6

Length of admission at the point of data collection ranged from 5 to 199 weeks. There was no significant relationship between duration of admission and SNAP overall total score.

Discussion

This study found that 15 of the 33 patients in medium security in Northern Ireland (45%) could potentially be managed in a low secure setting, with a further 2 patients (6%) who could potentially be managed in an open ward. There is a significant difference in security needs between the three wards, with patients in Ward 3 being primarily ‘low secure’. Approximately a third of patients require more than 5 years of further treatment in a secure psychiatric facility, 9% require long-term treatment in medium security and 27% require long-term treatment in low security.

These results are comparable with those of Reed, ^{Reference Collins and Davies9} who conducted a survey of all National Health Service and independent sector medium secure units in England and Wales. It was concluded that 15% of these patients required long-term medium security based on the views of their consultant psychiatrist. A further 21% were thought to require long-term low secure care.

Forensic services across the UK generally provide a medium secure service, with less emphasis on the other levels of security. This study highlights that the needs of the forensic in-patient population of Northern Ireland could be met across a range of security levels. The SNAP identified that particularly important aspects of security in this cohort of patients include high relational nursing skills, engagement with treatment and management of violence and aggression. Those individuals whose security needs revolve around relational security more so than physical security could potentially be managed in a low secure setting with a carefully tailored care plan, rather than being unnecessarily restricted in medium security. The SNAP may have a role in identifying these individuals as an aid to structured professional judgement.

There are several routes out of medium-term medium secure units, but often these alternatives are underdeveloped and underfunded. One option is long-term medium security, often provided by the private sector, but not currently available in Northern Ireland. An alternative is long-term low security. There is considerable variation in low secure provision throughout Northern Ireland, as there is elsewhere in the UK, both in terms of the number of places available and the quality of rehabilitation and therapeutic interventions. This may highlight the need for expansion of low secure services on a regional basis, as has been suggested in England, in order to accommodate patients ‘stepping down’ from medium security. In order to get a true picture of the scale of low secure provision that is required, it would be useful to examine delayed discharges in psychiatric intensive care units and to identify individuals with frequent admissions to general adult psychiatric wards whose needs would be best met in a low secure environment.

An alternative route out of medium security is to supported community accommodation. Again, there are limited resources and options in this area, particularly for patients in forensic services. Community placements can be strengthened by the involvement of specialist community forensic mental health teams. These teams can provide assertive treatment in the community and could also potentially provide in-reach services to low secure units and open wards in order to accommodate these patients at lower levels of security. This may require greater co-working between forensic services and general adult psychiatry.

Throughout the UK there is a need to establish better pathways out of medium security. This would improve patient flow throughout the system of secure care and could allow for greater diversion of individuals from prison and courts into mental healthcare. Patients would be cared for in the least restrictive environment necessary and limited resources could be employed most effectively and efficiently.

This study suggests that in Northern Ireland a lack of low secure provision and supported community placements is contributing to some patients being treated in a higher level of security than they necessarily require. This problem may be compounded by forensic services in general seeing their role as providing a medium secure service. This study should be replicated on a UK-wide basis in all medium secure beds to determine whether forensic services are dictating the security level of provision or are responding to the needs of their population.