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Author

  • Helen Leonard
Abstract
Open Access
Article

A comparison of autism prevalence trends in Denmark and Western Australia

Parner, E. T., Thorsen, P., Dixon, G., De Klerk, N., Leonard, H., Nassar, N., Bourke, J., Bower, C. & Glasson, E. J., 2011, In : Journal of Autism and Developmental Disorders. 41, 12, p. 1601-1608 1608 p.

Research output: Contribution to journalArticle

45 Citations (Scopus)

A framework for understanding quality of life domains in individuals with the CDKL5 deficiency disorder

Tangarorang, J., Leonard, H., Epstein, A. & Downs, J., Feb 2019, In : American Journal of Medical Genetics Part A. 179, 2, p. 249-256 8 p.

Research output: Contribution to journalArticle

1 Citation (Scopus)

Altered attainment of developmental milestones influences the age of diagnosis of Rett syndrome

Fehr, S., Bebbington, A., Ellaway, C., Rowe, P., Leonard, H. & Downs, J., 2011, In : Journal of Child Neurology. 26, 8, p. 980-987

Research output: Contribution to journalArticle

29 Citations (Scopus)

An exploration of the use of eye gaze and gestures in females with Rett Syndrome

Urbanowicz, A., Downs, J. A., Girdler, S., Ciccone, N. & Leonard, H., 2016, In : Journal of Speech, Language, and Hearing Research. 59, 6, p. 1373-1383 11 p.

Research output: Contribution to journalArticle

5 Citations (Scopus)

An investigation of the determinants of quality of life in adolescents and young adults with Down syndrome

Haddad, F., Bourke, J., Wong, K. & Leonard, H., 1 Jun 2018, In : PLoS One. 13, 6, 0197394.

Research output: Contribution to journalArticle

Open Access
3 Citations (Scopus)

Apgar score and risk of autism

Modabbernia, A., Sandin, S., Gross, R., Leonard, H., Gissler, M., Parner, E. T., Francis, R., Carter, K., Bresnahan, M., Schendel, D., Hornig, M. & Reichenberg, A., Feb 2019, In : European Journal of Epidemiology. 34, 2, p. 105-114 10 p.

Research output: Contribution to journalArticle

Open Access
4 Citations (Scopus)

A Population-Based Matched-Sibling Analysis Estimating the Associations Between First Interpregnancy Interval and Birth Outcomes

Regan, A. K., Ball, S. J., Warren, J. L., Malacova, E., Padula, A., Marston, C., Nassar, N., Stanley, F., Leonard, H., de Klerk, N. & Pereira, G., Jan 2019, In : American Journal of Epidemiology. 188, 1, p. 9-16 8 p.

Research output: Contribution to journalArticle

Open Access
7 Citations (Scopus)

A qualitative investigation of recovery after femoral fracture in Rett syndrome

Horne, T., Leonard, H., Stannage, K. & Downs, J., 1 Mar 2017, In : Child: Care, Health and Development. 43, 2, p. 232-239 8 p.

Research output: Contribution to journalArticle

Open Access
File
2 Citations (Scopus)
347 Downloads (Pure)
Open Access

Aspects of speech-language abilities are influenced by MECP2 mutation type in girls with Rett syndrome

Urbanowicz, A., Downs, J., Girdler, S. J., Ciccone, N. A. & Leonard, H., 21 Jan 2015, In : American Journal of Medical Genetics, Part A. 167, 2, p. 354-362 9 p.

Research output: Contribution to journalArticle

Open Access
File
16 Citations (Scopus)
249 Downloads (Pure)
Open Access

Assessment and management of nutrition and growth in rett syndrome

Leonard, H., Ravikumara, M., Baikie, G., Naseem, N., Ellaway, C., Percy, A., Abraham, S., Geerts, S., Lane, J., Jones, M., Bathgate, K. & Downs, J., Oct 2013, In : Journal of Pediatric Gastroenterology and Nutrition. 57, 4, p. 451-460

Research output: Contribution to journalArticle

Open Access
29 Citations (Scopus)

Association between interpregnancy interval and adverse birth outcomes in women with a previous stillbirth: an international cohort study

Regan, A. K., Gissler, M., Magnus, M. C., Håberg, S. E., Ball, S., Malacova, E., Nassar, N., Leonard, H. & Pereira, G., 13 Apr 2019, In : The Lancet. 393, 10180, p. 1527-1535 9 p.

Research output: Contribution to journalArticle

Open Access
File
7 Citations (Scopus)
409 Downloads (Pure)

Association of Genetic and Environmental Factors with Autism in a 5-Country Cohort

Bai, D., Yip, B. H. K., Windham, G. C., Sourander, A., Francis, R., Yoffe, R., Glasson, E., Mahjani, B., Suominen, A., Leonard, H., Gissler, M., Buxbaum, J. D., Wong, K., Schendel, D., Kodesh, A., Breshnahan, M., Levine, S. Z., Parner, E. T., Hansen, S. N., Hultman, C. & 2 others, Reichenberg, A. & Sandin, S., 1 Jan 2019, In : JAMA Psychiatry. 76, 10, p. 1035-1043

Research output: Contribution to journalArticle

26 Citations (Scopus)
Open Access
File
37 Citations (Scopus)
269 Downloads (Pure)

Association of gestational age at birth with reasons for subsequent hospitalisation: 18 Years of follow-up in a Western Australian population study

Srinivasjois, R., Slimings, C., Einarsdóttir, K., Burgner, D. & Leonard, H., 26 Jun 2015, In : PLoS One. 10, 6, p. 1-11

Research output: Contribution to journalArticle

Open Access
16 Citations (Scopus)

Australian children living with rare diseases: experiences of diagnosis and perceived consequences of diagnostic delays

Zurynski, Y., Deverell, M., Dalkeith, T., Johnson, S., Christodoulou, J., Leonard, H. & Elliott, E. J., 11 Apr 2017, In : Orphanet Journal of Rare Diseases. 12, 1, 9 p., 68.

Research output: Contribution to journalArticle

Open Access
28 Citations (Scopus)

Autism and intellectual disability are differentially related to sociodemographic background at birth

Leonard, H., Glasson, E., Nassar, N., Whitehouse, A., Bebbington, A., Bourke, J., Jacoby, P., Dixon, G., Malacova, E., Bower, C. & Stanley, F., 2011, In : PLoS One. 6, 3, p. e17875

Research output: Contribution to journalArticle

Open Access
61 Citations (Scopus)

Autism risk associated with parental age and with increasing difference in age between the parents

Sandin, S., Schendel, D., Magnusson, P., Hultman, C., Surén, P., Susser, E., GrØnborg, T., Gissler, M., Gunnes, N., Gross, R., Henning, M., Bresnahan, M., Sourander, A., Hornig, M., Carter, K., Francis, R., Parner, E., Leonard, H., Rosanoff, M., Stoltenberg, C. & 1 others, Reichenberg, A., 2016, In : Molecular Psychiatry. 21, 5, p. 693-700 8 p.

Research output: Contribution to journalArticle

Open Access
77 Citations (Scopus)

Autonomic breathing abnormalities in Rett syndrome: Caregiver perspectives in an international database study

MacKay, J., Downs, J., Wong, K., Heyworth, J., Epstein, A. & Leonard, H., 28 Apr 2017, In : Journal of Neurodevelopmental Disorders. 9, 1, 13 p., 15.

Research output: Contribution to journalArticle

Open Access
12 Citations (Scopus)

A validation study of a modified Bouchard activity record that extends the concept of 'uptime' to Rett syndrome

Lor, L., Hill, K., Jacoby, P., Leonard, H. & Downs, J., Dec 2015, In : Developmental Medicine and Child Neurology. 57, 12, p. 1137-1142

Research output: Contribution to journalArticle

Open Access
7 Citations (Scopus)
11 Citations (Scopus)

Birth seasonality and risk of autism spectrum disorder

Lee, B. K., Gross, R., Francis, R. W., Karlsson, H., Schendel, D. E., Sourander, A., Reichenberg, A., Parner, E. T., Hornig, M., Yaniv, A., Leonard, H. & Sandin, S., 15 Aug 2019, In : European Journal of Epidemiology. 34, 8, p. 785-792 8 p.

Research output: Contribution to journalArticle

Open Access
5 Citations (Scopus)

Bone mineral content and density in rett syndrome and their contributing factors

Jefferson, A. L., Woodhead, H. J., Fyfe, S., Briody, J., Bebbington, A., Strauss, B. J., Jacoby, P. & Leonard, H., 2011, In : Pediatric Research. 69, 4, p. 293-298

Research output: Contribution to journalArticle

26 Citations (Scopus)
11 Citations (Scopus)

Building the repertoire of measures of walking in Rett syndrome

Stahlhut, M., Downs, J., Leonard, H., Bisgaard, A. M. & Nordmark, E., 11 Sep 2017, In : Disability and Rehabilitation. 39, 19, p. 1926-1931 6 p.

Research output: Contribution to journalArticle

7 Citations (Scopus)

Caesarean section and risk of autism across gestational age: a multi-national cohort study of 5 million births

Yip, B. H. K., Leonard, H., Stock, S., Stoltenberg, C., Francis, R. W., Gissler, M., Gross, R., Schendel, D. & Sandin, S., Apr 2017, In : International Journal of Epidemiology. 46, 2, p. 429-439 11 p.

Research output: Contribution to journalArticle

19 Citations (Scopus)

Caring for a child with severe intellectual disability in China: The example of Rett syndrome

Lim, F., Downs, J., Li, J., Bao, X-H. & Leonard, H., 2013, In : Disability and Rehabilitation. 35, p. 343-351

Research output: Contribution to journalArticle

7 Citations (Scopus)

CDK variants variant: Improving our understanding of a rare neurologic disorder

Hector, R. D., Kalscheuer, V. M., Hennig, F., Leonard, H., Downs, J., Clarke, A., Benke, T. A., Armstrong, J., Pineda, M., Bailey, M. E. S. & Cobb, S. R., Dec 2017, In : Neurology: Genetics. 3, 6, 10 p., 200.

Research output: Contribution to journalArticle

Open Access

Change in gross motor abilities of girls and women with rett syndrome over a 3- to 4-year period

Foley, K-R., Downs, J., Bebbington, A., Jacoby, P., Girdler, S., Kaufmann, W. E. & Leonard, H., 2011, In : Journal of Child Neurology. 26, 10, p. 1237-1245

Research output: Contribution to journalArticle

28 Citations (Scopus)

Changes in caesarean delivery rates in Western Australia from 1995 to 2010 by gestational age at birth

Einarsdõttir, K., Ball, S., Pereira, G., Griffin, C., Jacoby, P., De Klerk, N., Leonard, H. & Stanley, F., 25 Jun 2015, In : Paediatric and Perinatal Epidemiology. 29, 4, p. 290-298 9 p.

Research output: Contribution to journalArticle

2 Citations (Scopus)

Changes in risk factors for preterm birth in Western Australia 1984-2006

Hammond, G., Langridge, A., Leonard, H., Hagan, R., Jacoby, P., De Klerk, N., Pennell, C. & Stanley, F., Aug 2013, In : BJOG: an International Journal of Obstetrics and Gynaecology. 120, 9, p. 1051-1060

Research output: Contribution to journalArticle

Open Access
17 Citations (Scopus)

Choice making in Rett syndrome: a descriptive study using video data

Urbanowicz, A., Ciccone, N., Girdler, S., Leonard, H. & Downs, J., 27 Mar 2018, In : Disability and Rehabilitation. 40, 7, p. 813-819 7 p.

Research output: Contribution to journalArticle

Open Access
File
3 Citations (Scopus)
228 Downloads (Pure)

Clinical guidelines for management of bone health in Rett syndrome based on expert consensus and available evidence

Jefferson, A., Leonard, H., Siafarikas, A., Woodhead, H., Fyfe, S., Ward, L. M., Munns, C., Motil, K., Tarquinio, D., Shapiro, J. R., Brismar, T., Ben-Zeev, B., Bisgaard, A. M., Coppola, G., Ellaway, C., Freilinger, M., Geerts, S., Humphreys, P., Jones, M., Lane, J. & 10 others, Larsson, G., Lotan, M., Percy, A., Pineda, M., Skinner, S., Syhler, B., Thompson, S., Weiss, B., Engerström, I. W. & Downs, J., 5 Feb 2016, In : PLoS One. 11, 2, p. 1-18 19 p., e0146824.

Research output: Contribution to journalArticle

Open Access
File
20 Citations (Scopus)
369 Downloads (Pure)

Community participation: Conversations with parent-Carers of young women with Rett syndrome

Walker, E. M., Crawford, F. & Leonard, H., 2014, In : Journal of Intellectual and Developmental Disability. 39, 3, p. 243-252

Research output: Contribution to journalArticle

6 Citations (Scopus)

Community participation for girls and women living with Rett syndrome

Andrews, J., Leonard, H., Hammond, G., Girdler, S., Rajapaksa, R., Bathgate, K. & Downs, J., Jun 2014, In : Disability and Rehabilitation. 36, 11, p. 894-899

Research output: Contribution to journalArticle

10 Citations (Scopus)
2 Citations (Scopus)

Conceptualizing a quality of life framework for girls with Rett syndrome using qualitative methods

Epstein, A., Leonard, H., Davis, E., Williams, K., Reddihough, D., Murphy, N., Whitehouse, A. & Downs, J., 17 Feb 2016, In : American Journal of Medical Genetics, Part A. 170, 3, p. 645-653 9 p.

Research output: Contribution to journalArticle

Open Access
File
28 Citations (Scopus)
120 Downloads (Pure)

Content validation of the Quality of Life Inventory—Disability

Epstein, A., Williams, K., Reddihough, D., Murphy, N., Leonard, H., Whitehouse, A., Jacoby, P. & Downs, J., 1 Jan 2019, In : Child: Care, Health and Development. 45, 5, p. 654-659 6 p.

Research output: Contribution to journalArticle

Data Linkage: Canadian and Australian Perspectives on a Valuable Methodology for Intellectual and Developmental Disability Research

Balogh, R., Leonard, H., Bourke, J., Brameld, K., Downs, J., Hansen, M., Glasson, E., Lin, E., Lloyd, M., Lunsky, Y., O'Donnell, M., Shooshtari, S., Wong, K. & Krahn, G., 1 Oct 2019, In : Intellectual and developmental disabilities. 57, 5, p. 439-462 24 p.

Research output: Contribution to journalArticle

Day occupation is associated with psychopathology for adolescents and young adults with Down syndrome

Foley, K. R., Jacoby, P., Einfeld, S. L., Girdler, S. J., Bourke, J. P., Riches, V. C. & Leonard, H., 3 Oct 2014, In : BMC Psychiatry. 14, 1, 8 p., 266.

Research output: Contribution to journalArticle

Open Access
8 Citations (Scopus)

Dental admissions in children under two years – a total-population investigation

Slack-Smith, L., Colvin, L., Leonard, H., Kilpatrick, N., Read, A. & Messer, L. B., 2012, In : Child: Care, Health and Development. 39, 2, p. 253-259

Research output: Contribution to journalArticle

7 Citations (Scopus)

Determinants of sleep disturbances in Rett syndrome: Novel findings in relation to genotype

Boban, S., Wong, K., Epstein, A., Anderson, B., Murphy, N., Downs, J. & Leonard, H., 2016, In : American Journal of Medical Genetics, Part A. 170, 9, p. 2292-2300 9 p.

Research output: Contribution to journalArticle

10 Citations (Scopus)
1 Citation (Scopus)

Direct Health Care Costs of Children and Adolescents with Down Syndrome

Geelhoed, E., Bebbington, A., Bower, C., Deshpande, A. & Leonard, H., 2011, In : Journal of Pediatrics. 159, p. 541-545

Research output: Contribution to journalArticle

21 Citations (Scopus)

Early development and regression in Rett syndrome

Lee, J. Y. L., Leonard, H., Piek, J. P. & Downs, J., 2013, In : Clinical Genetics. online, 6, p. 572-576

Research output: Contribution to journalArticle

18 Citations (Scopus)

Early mortality and primary causes of death in mothers of children with intellectual disability or Autism spectrum disorder: A retrospective cohort study

Fairthorne, J., Hammond, G., Bourke, J., Jacoby, P. & Leonard, H., 2014, In : PLoS One. 9, 12, p. e113430

Research output: Contribution to journalArticle

Open Access
9 Citations (Scopus)

Environmental enrichment intervention for Rett syndrome: An individually randomised stepped wedge trial

Downs, J., Rodger, J., Li, C., Tan, X., Hu, N., Wong, K., De Klerk, N. & Leonard, H., 10 Jan 2018, In : Orphanet Journal of Rare Diseases. 13, 1, 3.

Research output: Contribution to journalArticle

Open Access
13 Citations (Scopus)