By Dr Katya Numbers

Journal articles

Sabatini S; Numbers K; Kochan NA; Sachdev PS; Brodaty H, 2025, 'Levels and changes in cognitive, mental, and physical health as correlates of attitudes to aging in very old age', Frontiers in Psychiatry, 16, http://dx.doi.org/10.3389/fpsyt.2025.1567754

Samtani S; Mahalingam G; Lam BCP; Lipnicki DM; Numbers K; Lima-Costa MF; Blay SL; Costa EC; Xiao S; Reidel-Heller S; Röhr S; Pabst A; Scarmeas N; Yannakoulia M; Kosmidis M; Krishna M; Kumaran K; Shahar S; Ng TP; Ho R; Kim K-W; Skoog I; Najar J; Sterner TR; Ganguli M; Chang C-CH; Hughes TF; Sachdev PS; Brodaty H; International Consortium Cosmic FTCSOMIA, 2025, 'Emotional and instrumental social support and older adults' depressive symptoms: Collaborative individual participant data meta-analysis of 11 population-based studies of ageing.', Am J Epidemiol, http://dx.doi.org/10.1093/aje/kwaf137

Loyal MS; Numbers K; Reppermund S; Brodaty H; Sachdev PS; Mewton L; Jiang J; Lam BCP, 2025, 'Longitudinal associations between late-life depression, cerebrovascular disease and cognition', Journal of Affective Disorders, 376, pp. 59 - 67, http://dx.doi.org/10.1016/j.jad.2025.01.147

Sawang J; Numbers K; Lam BCP; Reppermund S, 2025, 'Relationships Between Functional Impairment, Depressive Symptoms, and Ageing Attitudes in Older Adults', Diagnostics, 15, http://dx.doi.org/10.3390/diagnostics15091145

Chander RJ; Numbers K; Grainger SA; Cleary R; Mather KA; Kochan NA; Brodaty H; Henry JD; Sachdev PS, 2025, 'Differential Social Cognitive Performance in Older Adults With Mild Cognitive Impairment and Dementia', American Journal of Geriatric Psychiatry, 33, pp. 248 - 259, http://dx.doi.org/10.1016/j.jagp.2024.08.008

Sabatini S; Numbers K; Kochan NA; Sachdev PS; Brodaty H, 2025, 'Associations between Attitudes to Aging with concurrent and twelve-year change in cognitive functioning in very old individuals', International Psychogeriatrics, http://dx.doi.org/10.1016/j.inpsyc.2025.100045

Chen J; Numbers K; Lo J; Sachdev PS; Kochan NA; Crawford JD; Brodaty H, 2025, 'Do changed behaviors predict cognitive decline in a community sample?', International Psychogeriatrics, http://dx.doi.org/10.1016/j.inpsyc.2025.100076

Vella AS; Selwood A; Catts VS; Numbers KT; Lee T; Thalamuthu A; Karlsson IK; Reynolds CA; Franz CE; Kremen WS; Gatz M; Sachdev PS, 2024, 'Basic Science and Pathogenesis', Alzheimer's & dementia : the journal of the Alzheimer's Association, 20, pp. e088371, http://dx.doi.org/10.1002/alz.088371

Numbers KT; Chander RJ; Chen J; Brodaty H, 2024, 'Clinical Manifestations', Alzheimer's & dementia : the journal of the Alzheimer's Association, 20, pp. e092087, http://dx.doi.org/10.1002/alz.092087

Xu X; Catts VS; Harris K; Wang N; Numbers K; Trollor J; Brodaty H; Sachdev PS; Schutte AE, 2024, 'The contribution of cumulative blood pressure load to dementia, cognitive function and mortality in older adults', Journal of Hypertension, 42, pp. 1922 - 1931, http://dx.doi.org/10.1097/HJH.0000000000003808

Stemmler M; Arnold M; Numbers K; Kochan NA; Sachdev PS; Brodaty H, 2024, 'The Usefulness of the Regression-Based Normed SKT Short Cognitive Performance Test in Detecting Cognitive Impairment in a Community Sample', Diagnostics, 14, http://dx.doi.org/10.3390/diagnostics14192199

Fongang B; Sargurupremraj M; Jian X; Mishra A; Damotte V; de Rojas I; Skrobot O; Bis JC; Fan KH; Jacobsen E; Li GHY; Yang J; Alessandra B; Alessandra L; Hilal S; Chong JR; Chai YL; Knol MJ; Concas MP; Giorgia G; Riaz M; Yu C; Guojonsson A; Lacaze P; Naj AC; Gireud-Goss M; Wadop YN; Soumare A; Bouteloup V; Gudnason V; Battista P; Santin A; Spedicati B; Sardone R; Launer L; Bressler J; Gottesman RF; Grand QL; Caro I; Roshchupkin GV; Leonard HL; Yang C; Bartz TM; Bordes C; Ridker PM; Geerlings MI; Gasca NC; Manichaikul A; Nalls MA; Rich SS; Schmidt CO; Trompet S; van Setten J; van Vugt M; Grabe HJ; Jukema JW; Rissanen IL; Wassertheil-Smoller S; Ikram MA; Simonsick EM; Longstreth WT; Chasman DI; Rotter JI; Sattar N; Stott DJ; Shiroma EJ; Sigurdsson S; Ghanbari M; Schminke U; Boerwinkle E; Aparicio HJ; Beiser AS; Romero JR; Lioutas V; Wang R; Sarnowski C; Teumer A; Völker U; Mosley TH; Marquié M; García-González P; Olivé C; Puerta R; Cano A; Sotolongo-Grau O; Valero S; Pytel VV; Rosende-Roca M; Alegret M; Tàrraga L; Boada M; Carracedo Á; Franco-Macías E; Piñol-Ripoll G; Garcia-Ribas G; Pérez-Tur J; Royo JL; García-Alberca JM; Real LM; Sáez ME, 2024, 'A genome-wide association meta-analysis of all-cause and vascular dementia', Alzheimer S and Dementia, 20, pp. 5973 - 5995, http://dx.doi.org/10.1002/alz.14115

Bilgrami A; Aghdaee M; Gu Y; Cutler H; Numbers K; Kochan NA; Sachdev PS; Brodaty H, 2024, 'Patterns in health care use and intensity for diagnosed and undiagnosed cognitive impairment in the older australian community: Implications for primary care management', Ssm Population Health, 27, http://dx.doi.org/10.1016/j.ssmph.2024.101693

Zhang LL; Numbers K; Brodaty H; Lam BCP; Mahalingam G; Reppermund S, 2024, 'Does Mild Functional Impairment Predict Dementia in Older Adults with Normal Cognition?', Alzheimer Disease and Associated Disorders, 38, pp. 257 - 264, http://dx.doi.org/10.1097/WAD.0000000000000638

Truong QC; Choo C; Numbers K; Merkin AG; Sachdev PS; Feigin VL; Brodaty H; Kochan NA; Medvedev ON, 2024, 'Enhancing precision of the 16-item Informant Questionnaire on Cognitive Decline in the Elderly (IQCODE-16) using Rasch methodology', International Psychogeriatrics, 36, pp. 166 - 176, http://dx.doi.org/10.1017/S1041610221002568

Truong QC; Cervin M; Choo CC; Numbers K; Bentvelzen AC; Kochan NA; Brodaty H; Sachdev PS; Medvedev ON, 2024, 'Examining the validity of the Mini-Mental State Examination (MMSE) and its domains using network analysis', Psychogeriatrics, 24, pp. 259 - 271, http://dx.doi.org/10.1111/psyg.13069

Kalam S; Numbers K; Lipnicki DM; Lam BCP; Brodaty H; Reppermund S, 2024, 'The combination of olfactory dysfunction and depression increases the risk of incident dementia in older adults', International Psychogeriatrics, 36, pp. 130 - 141, http://dx.doi.org/10.1017/S1041610223000480

Litkouhi PN; Numbers K; Valenzuela M; Crawford JD; Lam BCP; Litkouhi PN; Sachdev PS; Kochan NA; Brodaty H, 2024, 'Critical periods for cognitive reserve building activities for late life global cognition and cognitive decline: the Sydney memory and aging cohort study', Aging Neuropsychology and Cognition, 31, pp. 387 - 403, http://dx.doi.org/10.1080/13825585.2023.2181941

Chan LLY; Delbaere K; Numbers K; Lam B; Menant J; Sturnieks DL; Trollor JN; Brodie MA; Lord SR, 2024, 'Poor mobility and lower limb weakness are associated with three distinct depressive symptom trajectories over 6 years in older people', Australasian Journal on Ageing, 43, pp. 333 - 342, http://dx.doi.org/10.1111/ajag.13273

Chakraborty M; Dhiman K; Sachdev PS; Brodaty H; Draper B; Trollor JN; Reppermund S; Kang K; Mather KA; Poljak A; Wen W; Numbers KT; Kochan NA; Catts VS; Gupta V, 2024, 'Glutaric acid associates with early detection of cognitive impairment deciphering the association with depression', Alzheimer's & Dementia, 20, pp. e088825, http://dx.doi.org/10.1002/alz.088825

Chander RJ; Numbers KT; Chen R; Samtani S; Kochan NA; Brodaty H; Sachdev PS, 2024, 'Social, environmental, and cognitive correlates of community‐dwelling older adults coping poorly with reduced social contact: A quasi‐experiment set in Australia’s COVID‐19 lockdown in 2020', Alzheimer's & Dementia, 20, http://dx.doi.org/10.1002/alz.092104

Yan VYX; Numbers K; Sachdev PS; Brodaty H; Medvedev ON, 2023, 'Application of generalizability theory to evaluate the Kessler Psychological Distress Scale and distinguish between enduring and dynamic distress', Journal of Affective Disorders Reports, 14, pp. 100668, http://dx.doi.org/10.1016/j.jadr.2023.100668

Mahalingam G; Samtani S; Lam BCP; Lipnicki DM; Lima-Costa MF; Blay SL; Castro-Costa E; Shifu X; Guerchet M; Preux PM; Gbessemehlan A; Skoog I; Najar J; Sterner TR; Scarmeas N; Yannakoulia M; Dardiotis T; Kim KW; Riedel-Heller S; Röhr S; Pabst A; Shahar S; Numbers K; Ganguli M; Hughes TF; Chang CCH; Crowe M; Ng TP; Gwee X; Chua DQL; Rymaszewska J; Wolf-Ostermann K; Welmer AK; Stafford J; Mélis R; Vernooij-Dassen M; Jeon YH; Sachdev PS; Brodaty H; Roehr S, 2023, 'Social connections and risk of incident mild cognitive impairment, dementia, and mortality in 13 longitudinal cohort studies of ageing', Alzheimer S and Dementia, 19, pp. 5114 - 5128, http://dx.doi.org/10.1002/alz.13072

Truong QC; Cervin M; Choo CC; Numbers K; Bentvelzen AC; Merkin AG; Sachdev PS; Feigin VL; Brodaty H; Kochan NA; Medvedev ON, 2023, 'Using network analysis to validate domains of the modified telephone interview for cognitive status', European Journal of Clinical Investigation, 53, pp. e14016, http://dx.doi.org/10.1111/eci.14016

Gong J; Harris K; Lipnicki DM; Castro-Costa E; Lima-Costa MF; Diniz BS; Xiao S; Lipton RB; Katz MJ; Wang C; Preux PM; Guerchet M; Gbessemehlan A; Ritchie K; Ancelin ML; Skoog I; Najar J; Sterner TR; Scarmeas N; Yannakoulia M; Kosmidis MH; Guaita A; Rolandi E; Davin A; Gureje O; Trompet S; Gussekloo J; Riedel-Heller S; Pabst A; Röhr S; Shahar S; Singh DKA; Rivan NFM; Boxtel MV; Köhler S; Ganguli M; Chang CC; Jacobsen E; Haan M; Ding D; Zhao Q; Xiao Z; Narazaki K; Chen T; Chen S; Ng TP; Gwee X; Numbers K; Mather KA; Scazufca M; Lobo A; De-la-Cámara C; Lobo E; Sachdev PS; Brodaty H; Hackett ML; Peters SAE; Woodward M; Roehr S, 2023, 'Sex differences in dementia risk and risk factors: Individual-participant data analysis using 21 cohorts across six continents from the COSMIC consortium', Alzheimer S and Dementia, 19, pp. 3365 - 3378, http://dx.doi.org/10.1002/alz.12962

Calkin CJ; Numbers K; Brodaty H; Sachdev PS; Medvedev ON, 2023, 'Measuring distress in older population: Rasch analysis of the Kessler Psychological Distress Scale', Journal of Affective Disorders, 330, pp. 117 - 124, http://dx.doi.org/10.1016/j.jad.2023.02.116

Hopkins EG; Leman PJ; Cervin M; Numbers K; Brodaty H; Kochan NA; Sachdev PS; Medvedev ON, 2023, 'Network of mental activities, cognitive function and depression in older men and women', Journal of Psychiatric Research, 162, pp. 113 - 122, http://dx.doi.org/10.1016/j.jpsychires.2023.05.030

Truong QC; Choo C; Numbers K; Bentvelzen A; Merkin AG; Brodaty H; Kochan NA; Feigin VL; Sachdev PS; Medvedev ON, 2023, 'Enhancing Precision of the Telephone Interview for Cognitive Status–Modified (TICS-M) Using the Rasch Model', Psychological Assessment, 35, pp. 559 - 571, http://dx.doi.org/10.1037/pas0001233

Truong QC; Numbers K; Choo CC; Bentvelzen AC; Catts VS; Cervin M; Jorm AF; Kochan NA; Brodaty H; Sachdev PS; Medvedev ON, 2023, 'Establishing conversion of the 16-item Informant Questionnaire on Cognitive Decline in the Elderly scores into interval-level data across multiple samples using Rasch methodology', Psychogeriatrics, 23, pp. 411 - 421, http://dx.doi.org/10.1111/psyg.12946

Selwood AE; Catts VS; Numbers K; Lee T; Thalamuthu A; Wright MJ; Sachdev PS, 2023, 'The Heritability of Subjective Cognitive Complaints in Older Australian Twins', Journal of Alzheimer’s Disease, 92, pp. 1015 - 1026, http://dx.doi.org/10.3233/jad-221008

Sprague BN; Zhu X; Rosso AL; Verghese J; Delbaere K; Lipnicki DM; Sachdev PS; Ng TP; Gwee X; Yap KB; Kim K-W; Han JW; Oh DJ; Narazaki K; Chen T; Chen S; Brodaty H; Numbers K; Kochan NA; Walker RW; Paddick S-M; Gureje O; Ojagbemi A; Bello T; Rosano C, 2023, 'Correlates of gait speed among older adults from six countries: Findings from the COSMIC collaboration.', The Journals of Gerontology Series A, 78, pp. 2396 - 2406, http://dx.doi.org/10.1093/gerona/glad090

Numbers K; Lam BCP; Crawford JD; Kochan NA; Sachdev PS; Brodaty H, 2023, 'Longitudinal changes in participant and informant reports of subjective cognitive complaints are associated with dementia risk', Frontiers in Aging Neuroscience, 15, pp. 1044807, http://dx.doi.org/10.3389/fnagi.2023.1044807

Numbers KT, 2023, 'Increased worry associated with self‐reported, but not informant‐reported, subjective cognitive decline predicts risk of incident dementia', Alzheimer's & Dementia, 19, http://dx.doi.org/10.1002/alz.075634

Samtani S; Mahalingam G; Lam BCP; Lipnicki DM; Costa E; Lima‐Costa MF; Xiao S; Scarmeas N; Kim KW; Numbers KT; Ganguli M; Krishna M; Ng TP; Sachdev PS; Brodaty H; Skoog I; Riedel‐Heller SG; Shahar S, 2023, 'Types of social support and depressive symptoms in older adults: An IPD meta‐analysis of longitudinal ageing studies', Alzheimer's & Dementia, 19, http://dx.doi.org/10.1002/alz.074525

Truong QC; Choo C; Numbers K; Merkin AG; Brodaty H; Kochan NA; Sachdev PS; Feigin VL; Medvedev ON, 2022, 'Applying generalizability theory to examine assessments of subjective cognitive complaints: whose reports should we rely on - participant versus informant?', International Psychogeriatrics, 34, pp. 1023 - 1033, http://dx.doi.org/10.1017/S1041610221000363

Hou J; Hess JL; Armstrong N; Bis JC; Grenier-Boley B; Karlsson IK; Leonenko G; Numbers K; O’Brien EK; Shadrin A; Thalamuthu A; Yang Q; Andreassen OA; Brodaty H; Gatz M; Kochan NA; Lambert JC; Laws SM; Masters CL; Mather KA; Pedersen NL; Posthuma D; Sachdev PS; Williams J; Fan CC; Faraone SV; Fennema-Notestine C; Lin SJ; Escott-Price V; Holmans P; Seshadri S; Tsuang MT; Kremen WS; Glatt SJ, 2022, 'Polygenic resilience scores capture protective genetic effects for Alzheimer’s disease', Translational Psychiatry, 12, pp. 296, http://dx.doi.org/10.1038/s41398-022-02055-0

Page ZA; Croot K; Sachdev PS; Crawford JD; Lam BCP; Brodaty H; Miller Amberber A; Numbers K; Kochan NA, 2022, 'Comparison of Computerised and Pencil-and-Paper Neuropsychological Assessments in Older Culturally and Linguistically Diverse Australians', Journal of the International Neuropsychological Society, 28, pp. 1050 - 1063, http://dx.doi.org/10.1017/S1355617721001314

Samtani S; Mahalingam G; Lam BCP; Lipnicki DM; Lima-Costa MF; Blay SL; Castro-Costa E; Shifu X; Guerchet M; Preux PM; Gbessemehlan A; Skoog I; Najar J; Rydberg Sterner T; Scarmeas N; Kim KW; Riedel-Heller S; Röhr S; Pabst A; Shahar S; Numbers K; Ganguli M; Jacobsen E; Hughes TF; Crowe M; Ng TP; Maddock J; Marseglia A; Mélis R; Szcześniak D; Wiegelmann H; Vernooij-Dassen M; Jeon YH; Sachdev PS; Brodaty H; Roehr S, 2022, 'Associations between social connections and cognition: a global collaborative individual participant data meta-analysis', Lancet Healthy Longevity, 3, pp. e740 - e753, http://dx.doi.org/10.1016/S2666-7568(22)00199-4

Page ZA; Croot K; Sachdev PS; Crawford JD; Lam BCP; Brodaty H; Miller Amberber A; Numbers K; Kochan NA, 2022, 'Comparison of computerised and pencil-and-paper neuropsychological assessments in older culturally and linguistically diverse Australians - CORRIGENDUM.', Journal of the International Neuropsychological Society, pp. 1 - 1, http://dx.doi.org/10.1017/s135561772200073x

Chalmers RA; Cervin M; Choo C; Baune BT; Trollor JN; Numbers K; Sachdev PS; Brodaty H; Kochan NA; Medvedev ON, 2022, 'Networks of inflammation, depression, and cognition in aging males and females', Aging Clinical and Experimental Research, 34, pp. 2387 - 2398, http://dx.doi.org/10.1007/s40520-022-02198-6

Jang S; Numbers K; Lam BCP; Sachdev PS; Brodaty H; Reppermund S, 2022, 'Performance-Based vs Informant-Reported Instrumental Activities of Daily Living in Predicting Dementia', Journal of the American Medical Directors Association, 23, pp. 1342 - 1347.e9, http://dx.doi.org/10.1016/j.jamda.2021.09.020

Numbers K; Jang S; Brodaty H; Sachdev PS; Draper B; Reppermund S, 2022, 'Instrumental Activities of Daily Living by Subjective and Objective Measures: The Impact of Depression and Personality', Frontiers in Aging Neuroscience, 14, pp. 829544, http://dx.doi.org/10.3389/fnagi.2022.829544

Numbers K, 2022, 'Emerging Neuropsychiatric Symptoms May Represent an Early Manifestation of Preclinical Alzheimer's Disease', Biological Psychiatry, 92, pp. e1 - e3, http://dx.doi.org/10.1016/j.biopsych.2022.04.013

Truong QC; Choo C; Numbers K; Merkin AG; Brodaty H; Kochan NA; Sachdev PS; Feigin VL; Medvedev ON, 2022, 'Clinical investigation of dynamic and enduring aspects of global cognition in aged population', European Journal of Clinical Investigation, 52, pp. e13681, http://dx.doi.org/10.1111/eci.13681

Kumar SS; Merkin AG; Numbers K; Sachdev PS; Brodaty H; Kochan NA; Trollor JN; Mahon S; Medvedev O, 2022, 'A Novel Approach to Investigate Depression Symptoms in the Aging Population Using Generalizability Theory', Psychological Assessment, 34, pp. 684 - 696, http://dx.doi.org/10.1037/pas0001129

Nosheny RL; Amariglio R; Sikkes SAM; Van Hulle C; Bicalho MAC; Dowling NM; Brucki SMD; Ismail Z; Kasuga K; Kuhn E; Numbers K; Aaronson A; Moretti DV; Pereiro AX; Sánchez-Benavides G; Sellek Rodríguez AF; Urwyler P; Zawaly K, 2022, 'The role of dyadic cognitive report and subjective cognitive decline in early ADRD clinical research and trials: Current knowledge, gaps, and recommendations', Alzheimer S and Dementia Translational Research and Clinical Interventions, 8, http://dx.doi.org/10.1002/trc2.12357

Numbers KT; Lam BCP; Crawford JD; Kochan NA; Sachdev PS; Brodaty H, 2022, 'Dyadic patterns of subjective cognitive reports as predictors of incident dementia', Alzheimer's & Dementia, 18, http://dx.doi.org/10.1002/alz.061351

Samtani S; Mahalingam S; Lam BCP; Lipnicki DM; Costa E; Xiao S; Guerchet M; Preux P; Skoog I; Scarmeas N; Kim KW; Riedel‐Heller SG; Hamid TA; Numbers KT; Ganguli M; Crowe MG; Ng TP; Sachdev PS; Brodaty H, 2022, 'The impact of social health on global cognition and cognitive domains: An individual participant level data meta‐analysis of longitudinal cohort studies of cognitive ageing', Alzheimer's & Dementia, 18, http://dx.doi.org/10.1002/alz.061062

Numbers K; Lam BCP; Crawford JD; Kochan NA; Sachdev PS; Brodaty H, 2021, 'Increased reporting of subjective cognitive complaints over time predicts cognitive decline and incident dementia', International Journal of Geriatric Psychiatry, 36, pp. 1739 - 1747, http://dx.doi.org/10.1002/gps.5594

Stevens A; Numbers K; Samtani S, 2021, 'Are lonely older adults more vulnerable to mental health issues during pandemics?', International Psychogeriatrics, 33, pp. 449 - 451, http://dx.doi.org/10.1017/S104161022100034X

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