Table 2.
Research themes on the APS nexus
| Research Themes | Degree centrality | Betweeness centrality | Relative Importance |
|---|---|---|---|
| Ageing | 125.00 | 130.38 | 1 |
| Older people | 41.00 | 246.88 | 2 |
| Health | 37.00 | 138.33 | 3 |
| Demography | 25.00 | 85.79 | 4 |
| Older adults | 22.00 | 91.65 | 5 |
| Gender | 22.00 | 46.81 | 6 |
| Population ageing | 22.00 | 34.85 | 7 |
| Ageing society | 20.00 | 20.00 | 8 |
| Active ageing | 20.00 | 19.32 | 9 |
| Quality of life | 18.00 | 68.45 | 10 |
| Elderly | 17.00 | 115.04 | 11 |
| Population | 17.00 | 17.58 | 12 |
| Climate change | 17.00 | 3.80 | 13 |
| Built environment | 14.00 | 19.13 | 14 |
| Ageing population | 14.00 | 11.78 | 15 |
| Technology | 13.00 | 16.15 | 16 |
| Dementia | 12.00 | 47.17 | 17 |
| Life expectancy | 12.00 | 45.60 | 18 |
| Ageing in place | 12.00 | 37.01 | 19 |
| Economic growth | 12.00 | 32.78 | 20 |
| Pension | 12.00 | 23.58 | 21 |
| Wellbeing | 12.00 | 3.13 | 22 |
| Social inclusion | 11.00 | 5.96 | 23 |
| Retirement | 11.00 | 4.43 | 24 |
| Policy | 10.00 | 137.57 | 25 |
| Life satisfaction | 10.00 | 23.44 | 26 |
| Fertility | 10.00 | 20.00 | 27 |
| Migration | 10.00 | 18.00 | 28 |
| Human-animal interaction | 10.00 | 12.00 | 29 |
| Education | 9.00 | 44.47 | 30 |
| Productive ageing | 8.00 | 93.43 | 31 |
| Mobility | 8.00 | 59.77 | 32 |
| Filial piety | 8.00 | 20.33 | 33 |
| Family | 8.00 | 14.12 | 34 |
| Cognition | 8.00 | 5.96 | 35 |
| Chronic diseases | 8.00 | 4.00 | 36 |
| Demographic transition | 8.00 | 3.57 | 37 |
| Housing | 8.00 | 2.38 | 38 |
| Accessibility | 8.00 | 1.21 | 39 |
| Telecare | 7.00 | 27.50 | 40 |
| Interventions | 7.00 | 20.00 | 41 |
| Gerontology | 7.00 | 16.76 | 42 |
| Volunteering | 7.00 | 14.43 | 43 |
| Motivation | 7.00 | 9.33 | 44 |
| Longevity | 7.00 | 4.27 | 45 |
| Care | 7.00 | 3.34 | 46 |
| Age | 7.00 | 2.52 | 47 |
| Successful ageing | 7.00 | 2.00 | 48 |
| Demographic change | 7.00 | 1.59 | 49 |
| Mental health | 6.00 | 28.25 | 50 |
| Healthy ageing | 6.00 | 14.39 | 51 |
| Healthcare | 6.00 | 10.23 | 52 |
| Age-friendly | 6.00 | 9.00 | 53 |
| Home | 6.00 | 5.66 | 54 |
| Ageism | 6.00 | 5.27 | 55 |
| The elderly | 6.00 | 4.33 | 56 |
| Third age | 6.00 | 3.76 | 57 |
| Travel behaviour | 6.00 | 2.37 | 58 |
| Identity | 6.00 | 2.16 | 59 |
| Services | 6.00 | 1.80 | 60 |
| Well-being | 6.00 | 1.28 | 61 |
| Social isolation | 6.00 | 0.40 | 62 |
| Neighbourhood | 5.00 | 11.00 | 63 |
| Rural | 5.00 | 8.75 | 64 |
| Local government | 5.00 | 8.56 | 65 |
| Old age | 5.00 | 7.27 | 66 |
| Social media | 5.00 | 4.73 | 67 |
| Leisure | 5.00 | 4.02 | 68 |
| Consumption | 5.00 | 3.27 | 69 |
| Spatial analysis | 5.00 | 2.72 | 70 |
| Women | 5.00 | 2.18 | 71 |
| Life-long learning | 5.00 | 1.51 | 72 |
| Loneliness | 5.00 | 0.50 | 73 |
| Long-term care | 4.00 | 4.50 | 74 |
| ICT | 4.00 | 3.10 | 75 |
| Elderly people | 4.00 | 3.00 | 76 |
| Higher education | 4.00 | 2.00 | 77 |
| Life course | 4.00 | 1.32 | 78 |
| Human capital | 4.00 | 2.87 | 79 |
| Older workers | 4.00 | 1.65 | 80 |
| Social capital | 4.00 | 1.32 | 81 |
| Social exclusion | 4.00 | 0.80 | 82 |
| Depression | 3.00 | 0.83 | 83 |
| Attitudes | 3.0 | 0.00 | 84 |
| Intergenerational | 3.00 | 0.00 | 85 |
| Later life | 3.00 | 0.00 | 86 |
| Mortality | 3.00 | 0.00 | 87 |
| Pension reform | 3.00 | 0.00 | 88 |
| Physical activity | 3.00 | 0.00 | 89 |
| Qualitative methods | 3.00 | 0.00 | 90 |
| Sustainability | 3.00 | 0.00 | 91 |
| Alzheimer’s disease | 2.00 | 0.00 | 92 |
| Caregiving | 2.00 | 0.00 | 93 |
| Disability | 2.00 | 0.00 | 94 |
| Health policy | 2.00 | 0.00 | 95 |
| Public health | 2.00 | 0.00 | 96 |
| Social policy | 2.00 | 0.00 | 97 |
| Sustainable development | 1.00 | 0.00 | 98 |