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Table 1 Characteristics of the included studies

From: Association between pain, neuropsychiatric symptoms, and physical function in dementia: a systematic review and meta-analysis

First author

Country, setting

Dementia

Population: selection on pain, NPS or function?

Quality of study**

Ahn 2013 [ 36 ]

USA, nh

Moderate dementia, mean MDS cognitive performance scale 3.17 (SD 1.52)

Age ≥ 65 years, excluded when comatose

10

Bartels 2003 [ 8 ]

USA, ltc

Dementia, AD or signs of chronic stable cognitive impairment (in chart or MDS)

At risk for (or having) pressure ulcers

4

Black 2006 [39]

USA, nh

Advanced dementia, SIRS mean 10.3 (SD 6.7), AD 58%

Palliative care (life expectancy ≤6 months)

6.5

Brummel-Smith 2002 [ 40 ]

USA, nh

Moderate to severe dementia, MMSE mean 16.8 (SD 5.6) for 92 subjects

Age ≥ 55 years, had to have pain assessment, able to self-report on their level of pain

7

Cipher 2004 [ 4 ]

USA, ltc

Moderate dementia, mean NCSE 0.10 (SD 0.91)

Referral to clinical psychologist due to change in cognitive functioning, emotional distress, or behavioural dysfunction associated with dementia

7.5

Cipher 2006 [ 41 ]

USA, ltc

Dementia, mild 40%, moderate 41% and severe 19%, according to FAST (Reisberg) NCSE

Referral to clinical psychologist due to change in cognitive functioning, emotional distress, or behavioural dysfunction associated with dementia

7.5

D’Astolfo 2006 [ 44 ]

Canada, ltc

In 4% no dementia with MMSE>25, mild dementia 27%, moderate 44%, severe 25%

Admission in ltc at least 6 months to allow for patient charts to be completed

7

Gruber-Baldini 2005 [ 45 ]

USA, nh and residential care/assisted living

Dementia, mild 14%, moderate 26% and severe 61%, according to MMSE or MDS-COGS.

Random sample aged ≥ 65 years (complete response 60%)

8.5

Kunik 2005 [ 34 ]

USA, va outpatients

Dementia, mild 46%, moderate 39%, severe 11%, according to DRS.

Veteran outpatients, not in LTC-facilities, with available caregiver

8.5

Leonard 2006 [ 50 ]

USA, nh

Dementia according to CPS-MDS dataset

At least one comprehensive MDS assessment, age ≥ 60 years

9

Leong 2007 [ 35 ]

Singapore, nh

Dementia with 33% mild (MIC) and 41% severe (SIC) cognitive impairment, according to AMT

No recent change in cognitive status, age ≥ 65 years. Here report of communicative subgroup with dementia (thus excluding 53 and including 125 of 358).

8.5

Lin 2011 [ 46 ]

Taiwan, nh

Dementia, 39% profound or end-stage dementia, according to CDR-C.

Admission at least 1 month

12

Morgan 2012 [ 47 ]

USA, Veterans Administration Medical Centre, longitudinal study

Dementia, DemRS2 mean 4.12 (SD 2.79)

> 60 years, no aggressive behaviour in past year, no residence in nh and caregiver > 8 hrs a week, no onset of aggression before first follow-up (at 5 mo)

9.5

Norton 2010 [ 42 ]

USA, nh

Dementia, MMSE mean 6.4 (SD 6.7)

Verbal disruption (BEHAVE-AD >= 1.5), age ≥ 55 years, passed audiological assessment, and life expectancy >6 mo

9

Shega 2005 [ 48 ]

USA, outpatient geriatrics clinic

Dementia, MMSE mean 16.6 (SD 7.2)

Patient-caregiver dyad with pain-report on same day (77% of original sample)

9.5

Shega 2010 [ 49 ]

Canada, community dwelling

Cognitive impairment, 3 MS, mild to moderate dementia 18.5%

Community dwelling people aged ≥ 65 years, within one inclusion wave a pain self-assessment was incorporated

9

Torvik 2010 [ 52 ]

Norway, nh

No (13%), mild (46%) or moderate (41%) cognitive impairment, according to MMSE.

MMSE > 11, aged ≥ 65 years (inclusion and response 35% of total sample). Communicative patients

6.5

Tosato 2012 [ 3 ]

EU and Israel, nh

Cognitive impairment, mild-moderate 55% and severe 45%, according to CPS

Several countries

11.5

Volicer 2009 [ 37 ]

Netherlands, nh/residential home

Dementia, according to MDS-CPS

Dependent in decision making, aged ≥ 65 years

11

Volicer 2011 [ 51 ]

Netherlands, nh, longitudinal study

Dementia, according to MDS

Availability of 4 quarterly MDS assessments within period of 15 months, aged ≥ 65 years

12

Williams 2005 [ 43 ]

USA, nh and residential care/assisted living

Dementia, with 29% MMSE>10 and MDS-COGS >2-4

Available pain data, aged ≥ 65 years

10

Zieber 2005 [38]

Canada, ltc

Moderate to severe cognitive impairment, according to FAST (Reisberg) score 6-7

Residents with continuous nursing care because of significant physical and/or cognitive impairments (‘nh-level’)

8

  1. Abbreviations: nh, nursing home; MDS, Minimum Dataset; ltc, long term care facility; AD, Alzheimer’s Disease; SIRS, The Severe Impairment Rating Scale; MMSE, Mini Mental State Examination; NCSE, Neurobehavioural Cognitive Status Examination; FAST, Functional Assessment Staging; MDS-COGS, Minimum Dataset Cognition Scale; va, veterans affairs; DRS, Dementia Rating Scale; CPS, Cognitive Performance Scale; AMT, Abbreviated Mental Test; CDR-C, Clinical Dementia Rating Scale-Chinese Version; Dem-RS2, Dementia Rating Scale 2; SD, Standard Deviation; BEHAVE-AD, Behavioural Pathology in Alzheimer’s disease.
  2. **Based on checklists from van der Windt et al. [52,53] Higher scores indicate higher quality (range observational studies 0–12, range longitudinal studies 0–14) Observational studies that scored ≥10 point were considered ‘high quality’. Longitudinal studies that scored ≥12 points were considered ‘high quality’.