KlaasJan Hajema

971 total citations
19 papers, 651 citations indexed

About

KlaasJan Hajema is a scholar working on General Health Professions, Health and Epidemiology. According to data from OpenAlex, KlaasJan Hajema has authored 19 papers receiving a total of 651 indexed citations (citations by other indexed papers that have themselves been cited), including 11 papers in General Health Professions, 7 papers in Health and 6 papers in Epidemiology. Recurrent topics in KlaasJan Hajema's work include Health disparities and outcomes (7 papers), Frailty in Older Adults (4 papers) and Health, psychology, and well-being (4 papers). KlaasJan Hajema is often cited by papers focused on Health disparities and outcomes (7 papers), Frailty in Older Adults (4 papers) and Health, psychology, and well-being (4 papers). KlaasJan Hajema collaborates with scholars based in Netherlands, Nepal and Taiwan. KlaasJan Hajema's co-authors include Ronald A. Knibbe, Elisabeth F. C. van Rossum, Anna Beurskens, Henrica C. W. de Vet, Gertrudis I. J. M. Kempen, Martin P.J. van Boxtel, Frans R.J. Verhey, Sebastian Köhler, Irene Heger and Marjolein de Vugt and has published in prestigious journals such as Addiction, BMC Public Health and BMJ Open.

In The Last Decade

KlaasJan Hajema

16 papers receiving 639 citations

Peers — A (Enhanced Table)

Peers by citation overlap · career bar shows stage (early→late) cites · hero ref

Name h Career Trend Papers Cites
KlaasJan Hajema Netherlands 13 236 189 157 138 129 19 651
Silke Mamone Germany 14 198 0.8× 192 1.0× 114 0.7× 65 0.5× 80 0.6× 27 555
Karen Hayman New Zealand 15 239 1.0× 284 1.5× 94 0.6× 113 0.8× 163 1.3× 24 950
Beate Gaertner Germany 16 352 1.5× 104 0.6× 122 0.8× 310 2.2× 139 1.1× 66 846
Erika Kobayashi Japan 20 416 1.8× 524 2.8× 142 0.9× 80 0.6× 165 1.3× 83 1.0k
Claudio Bilotta Italy 13 267 1.1× 172 0.9× 317 2.0× 41 0.3× 219 1.7× 19 730
K. S. Markides United States 12 137 0.6× 261 1.4× 146 0.9× 44 0.3× 131 1.0× 13 667
Marisa Silvana Zazzetta Brazil 17 362 1.5× 164 0.9× 217 1.4× 39 0.3× 225 1.7× 72 900
Kia‐Chong Chua United Kingdom 15 180 0.8× 152 0.8× 65 0.4× 119 0.9× 27 0.2× 40 646
Loretto Lacey United Kingdom 17 282 1.2× 89 0.5× 124 0.8× 103 0.7× 91 0.7× 37 794
Jinmyoung Cho United States 15 279 1.2× 324 1.7× 54 0.3× 69 0.5× 63 0.5× 41 811

Countries citing papers authored by KlaasJan Hajema

Since Specialization
Citations

This map shows the geographic impact of KlaasJan Hajema's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by KlaasJan Hajema with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites KlaasJan Hajema more than expected).

Fields of papers citing papers by KlaasJan Hajema

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by KlaasJan Hajema. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by KlaasJan Hajema. The network helps show where KlaasJan Hajema may publish in the future.

Co-authorship network of co-authors of KlaasJan Hajema

This figure shows the co-authorship network connecting the top 25 collaborators of KlaasJan Hajema. A scholar is included among the top collaborators of KlaasJan Hajema based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with KlaasJan Hajema. KlaasJan Hajema is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

19 of 19 papers shown
1.
Jongen, Ellen M.M., et al.. (2021). Risk factors of loneliness across the life span. Journal of Social and Personal Relationships. 39(5). 1482–1507. 38 indexed citations
2.
Heger, Irene, Sebastian Köhler, Martin P.J. van Boxtel, et al.. (2020). Raising awareness for dementia risk reduction through a public health campaign: a pre-post study. BMJ Open. 10(11). e041211–e041211. 38 indexed citations
3.
Nieboer, Anna P., KlaasJan Hajema, & Jane Murray Cramm. (2020). Relationships of self-management abilities to loneliness among older people: a cross-sectional study. BMC Geriatrics. 20(1). 184–184. 25 indexed citations
4.
5.
Beurskens, Anna, Henrica C. W. de Vet, Sander M. J. van Kuijk, et al.. (2019). The ability of four frailty screening instruments to predict mortality, hospitalization and dependency in (instrumental) activities of daily living. European Journal of Ageing. 16(3). 387–394. 37 indexed citations
6.
Heger, Irene, Kay Deckers, Martin P.J. van Boxtel, et al.. (2019). Dementia awareness and risk perception in middle-aged and older individuals: baseline results of the MijnBreincoach survey on the association between lifestyle and brain health. BMC Public Health. 19(1). 678–678. 71 indexed citations
7.
Hajema, KlaasJan, et al.. (2018). Population Characteristics and Needs of Informal Caregivers Associated With the Risk of Perceiving a High Burden: A Cross-Sectional Study. INQUIRY The Journal of Health Care Organization Provision and Financing. 55. 1141328402–1141328402. 15 indexed citations
8.
Pavlova, Milena, et al.. (2017). Social participation among older adults (55+): Results of a survey in the region of South Limburg in the Netherlands. Health & Social Care in the Community. 26(1). e85–e93. 45 indexed citations
9.
Rossum, Elisabeth F. C. van, et al.. (2017). Can resources moderate the impact of levels of frailty on adverse outcomes among (pre-) frail older people? A longitudinal study. BMC Geriatrics. 17(1). 185–185. 18 indexed citations
10.
Hajema, KlaasJan, et al.. (2017). Exploring Informal Caregivers’ Views on Their Perceived Burden. Home Health Care Management & Practice. 30(2). 47–53. 5 indexed citations
11.
Rossum, Elisabeth F. C. van, et al.. (2015). Fried phenotype of frailty: cross-sectional comparison of three frailty stages on various health domains. BMC Geriatrics. 15(1). 77–77. 111 indexed citations
12.
Bosma, Hans, et al.. (2015). Lonely at the bottom: a cross-sectional study on being ill, poor, and lonely. Public Health. 129(2). 185–187. 48 indexed citations
13.
Jansen, Maria, et al.. (2015). Eenzaam aan de onderkant : een studie naar ziekte, armoede en eenzaamheid. TSG - Tijdschrift voor gezondheidswetenschappen. 93(7). 268–273.
14.
Breugelmans, Oscar, et al.. (2013). Aircraft noise and health: is Lden the proper indicator to describe the relationship?. ISEE Conference Abstracts. 2013(1).
15.
Aarts, Sil, Marjan van den Akker, KlaasJan Hajema, et al.. (2010). Multimorbidity and its relation to subjective memory complaints in a large general population of older adults. International Psychogeriatrics. 23(4). 616–624. 40 indexed citations
16.
Hajema, KlaasJan, et al.. (1999). Social resources and alcohol-related losses as predictors of help seeking among male problem drinkers.. Journal of Studies on Alcohol. 60(1). 120–129. 45 indexed citations
17.
Hajema, KlaasJan & Ronald A. Knibbe. (1998). Changes in social roles as predictors of changes in drinking behaviour. Addiction. 93(11). 1717–1727. 95 indexed citations
18.
Hajema, KlaasJan, Ronald A. Knibbe, & Maria J. Drop. (1997). Effects of drinking patterns and social conditions on incidence and chronicity of alcohol-related problems. Contemporary Drug Problems. 24(3). 473–511.
19.
Hajema, KlaasJan, Ronald A. Knibbe, & Maria J. Drop. (1997). Changes in alcohol consumption in a general population in The Netherlands: a 9‐year follow‐up study. Addiction. 92(1). 49–60. 12 indexed citations

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

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