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Trial registered on ANZCTR

Registration number
Ethics application status
Date submitted
Date registered
Date last updated
Type of registration
Retrospectively registered

Titles & IDs
Public title
TRiM – Trial for Reducing Weight Retention in New Mums: A randomised controlled trial investigating the effectiveness of an innovative postpartum weight loss program.
Scientific title
A randomised controlled trial investigating the effectiveness of an innovative postpartum weight loss program in new mothers.
Secondary ID [1] 262809 0
Universal Trial Number (UTN)
Trial acronym
Linked study record

Health condition
Health condition(s) or problem(s) studied:
Postpartum weight retention 270515 0
Dietary intake/diet quality 270516 0
Insulin resistance 270518 0
Condition category
Condition code
Diet and Nutrition 270680 270680 0 0
Reproductive Health and Childbirth 270681 270681 0 0
Childbirth and postnatal care
Metabolic and Endocrine 270683 270683 0 0
Normal metabolism and endocrine development and function

Study type
Description of intervention(s) / exposure
Delivery of a program that combines self-monitoring delivered in a low-intensity delivery format (email and/or postal), paired with evidence-based postnatal nutrition and healthy lifestyle information - initiated in the late antenatal period through to 6 months postpartum. The intervention starts with a 1 hour nutrition assessment, goal setting and counselling session (delivered antenatally at approximately 36 weeks) delivered in line with the Australian Guide to Healthy Eating (+/- kilojoule restriction of 2000kJ/day, depending on lactation status), followed by fortnightly information and goal setting sheets posted from 6 weeks until 3 months postpartum, then monthly until 6 months. The sheets contain information on: nutrition post-pregnancy (+/-breastfeeding) + self monitoring (food groups; weight), practical ideas for cooking, shopping, larder, fridge, freezer; physical activity; balanced life.
Intervention code [1] 269158 0
Intervention code [2] 269176 0
Intervention code [3] 269186 0
Treatment: Other
Comparator / control treatment
Delivery of basic nutrition for breastfeeding information in the late antenatal period (Provision of ‘Healthy Eating for Breastfeeding’ diet sheet (5 minutes) at 36 weeks postpartum)
Control group

Primary outcome [1] 269398 0
Our primary hypothesis is that women in the intervention group will lose significantly more weight than women in the control group. This will be determined through an anthropometric assessment (weight will be measured to the nearest 0.1 kg using a spring balance scale).
Timepoint [1] 269398 0
36 weeks pregnancy, 6 weeks postpartum, 6 months post partum
Secondary outcome [1] 287551 0
1. have significantly better diet quality (using validated diet quality questionnaire -the 'Fat and Fibre' index)
Timepoint [1] 287551 0
36 weeks pregnancy, 6 weeks postpartum, 6 months post partum
Secondary outcome [2] 287597 0
2. undertake significantly more minutes of physical activity (AWAS - valid and reliable Australian Women's Activity Survey)
Timepoint [2] 287597 0
36 weeks pregnancy, 6 weeks postpartum, 6 months post partum
Secondary outcome [3] 287598 0
3. demonstrate significantly higher breastfeeding rates
(valid and reliable breastfeeding (and breastfeeding intention- survey from Nommsen-Rivers & Dewey (2009) Development and validation of the infant feeding intentions scale. Matern Child Health J, 13:334-342).
Timepoint [3] 287598 0
6 weeks postpartum, 6 months post partum
Secondary outcome [4] 287599 0
4. have significantly better fasting glucose and insulin levels (clinical measurements - blood tests)
Timepoint [4] 287599 0
36 weeks pregnancy, 6 weeks postpartum, 6 months post partum
Secondary outcome [5] 287600 0
5. significantly lower fat mass (FM) and significantly higher fat free mass (FFM).
Timepoint [5] 287600 0
Bioelectrocal impedence assay; 6 weeks postpartum, 6 months post partum

Key inclusion criteria
pre-pregnancy BMI > 25kg/m2, can read and speak English to a level that allows completion of intervention worksheets, and > 18years.
Minimum age
18 Years
Maximum age
No limit
Can healthy volunteers participate?
Key exclusion criteria
live outside the MMH catchment area, have delivered <36/40, have a pre-pregnancy diagnosis of type 1 or type 2 diabetes mellitus, or have a history of substance use or have a severe medical or psychological diagnosis that would prevent participation within the intervention

Study design
Purpose of the study
Allocation to intervention
Randomised controlled trial
Procedure for enrolling a subject and allocating the treatment (allocation concealment procedures)
The research midwife will approach eligible women at their 24th or 28th week antenatal clinic appointment and will enrol those who provide consent. Details will be provided to the research dietitian who will randomly allocate women to SC (supported care) or EC (enhanced care) based on envelopes provided by the Mater Medical Research Institute.
Methods used to generate the sequence in which subjects will be randomised (sequence generation)
Our method of randomisation was: stratified block randomisation using a randomisation table created by computer software; cards were produced and sealed in opaque envelopes for use by the research dietitian to allocate women following recruitment.

These have been stratified by BMI (25-30kg/m2; >30kg/m2).
Masking / blinding
Blinded (masking used)
Who is / are masked / blinded?

The people assessing the outcomes
Intervention assignment
Other design features
Not Applicable
Type of endpoint(s)
Statistical methods / analysis

Recruitment status
Date of first participant enrolment
Date of last participant enrolment
Date of last data collection
Sample size
Accrual to date
Recruitment in Australia
Recruitment state(s)

Funding & Sponsors
Funding source category [1] 269632 0
Name [1] 269632 0
Mater Health Services (Golden Casket Funding Round)
Address [1] 269632 0
Raymond Terrace, South Brisbane, Queensland, 4101
Country [1] 269632 0
Primary sponsor type
Dr Shelley Wilkinson
Senior Research Dietitian,
Mater Health Services,
Raymond Terrace, South Brisbane, Queensland, 4101
Secondary sponsor category [1] 266662 0
Name [1] 266662 0
Prof H David McIntyre
Address [1] 266662 0
Director of Obstetric Medicine,Mater Health Services,
Raymond Terrace, South Brisbane, Queensland, 4101
Country [1] 266662 0
Other collaborator category [1] 252188 0
Name [1] 252188 0
A/Prof Vicki Flenady
Address [1] 252188 0
Director of the Centre of Translating Research into Practice,
Mater Medical Research Institute,
Raymond Terrace, South Brisbane, Queensland, 4101
Country [1] 252188 0

Ethics approval
Ethics application status
Ethics committee name [1] 269576 0
Mater Human Ethics Research Committee
Ethics committee address [1] 269576 0
Mater Medical Research Institute, Aubigny Place, Raymond Terrace, South Brisbane, 4101, Queensland
Ethics committee country [1] 269576 0
Date submitted for ethics approval [1] 269576 0
Approval date [1] 269576 0
Ethics approval number [1] 269576 0

Brief summary
Retention of weight gained during pregnancy contributes to overweight and obesity and subsequent chronic disease risk, with the associated personal, financial and public health burdens. Women who are overweight or obese at beginning of pregnancy are more likely to gain excess weight and retain this weight after pregnancy. Women who do not lose weight by 6 months postpartum are more likely to be overweight or obese over the long term.

Approximately one third of women who deliver at the MMH are overweight or obese at the beginning of pregnancy. A 2008 MMH Nutrition and Dietetic audit demonstrated that, of the 102 women surveyed, 50% of the women who were overweight, 75% of women who were obese and 100% of women who were morbidly obese gained in excess of their recommended weight gain range for pregnancy. Our MMH patients are at very high risk of retaining weight after pregnancy and developing associated chronic diseases, thus implementation of weight management interventions is urgently required.

Limited data exist regarding the most effective methods of supporting weight loss after pregnancy. However, diet and exercise, with behavioural change and support are known to be important elements to be included in any program. Usual models of weight loss care (e.g. multiple group/clinic attendances) are not as appropriate in this population group due to childrearing demands.

Our research aim is to develop, implement and evaluate an innovative postpartum weight management program that includes evidence-based behaviour change strategies to support postpartum weight management that is delivered in a format suitable for MMH postnatal (PN) patients.
Trial website
Trial related presentations / publications
Wilkinson, SA., van der Pligt, P., Gibbons, K.S., & McIntyre, H.D. (2013). Trial for Reducing Weight Retention in New Mums (TRiM): A randomised controlled trial evaluating a low intensity, postpartum weight management program. Journal of Human Nutrition and Dietetics. EPub. DOI: 10.1111/jhn.12193

Wilkinson, SA. Gibbons, KS. & McIntyre, HD. Trial for the reduction of weight retention in new mums (TRiM): a randomised controlled trial investigating the effectiveness of an innovative, low intensity postpartum weight management program weight management program. 30th National Conference, Dietitians Association of Australia. Canberra, Australia, 23-25 May, 2013.

Public notes

Principal investigator
Name 32997 0
Dr Shelley Wilkinson
Address 32997 0
Dept of Dietetics
Mater Health Services
MCH - level 3, Allied Health, Raymond Tce
South Brisbane, Queensland. 4101
Country 32997 0
Phone 32997 0
+61 7 3163 6000
Fax 32997 0
Email 32997 0
Contact person for public queries
Name 16244 0
Dr Dr Shelley Wilkinson
Address 16244 0
c/o- Dept Nutrition and Dietetics
Mater Health Services
Lvl 3, MCH
Raymond Terrace
South Brisbane
Queensland, 4101
Country 16244 0
Phone 16244 0
+61 7 3163 8585
Fax 16244 0
+61 7 3163 8585
Email 16244 0
Contact person for scientific queries
Name 7172 0
Dr Dr Shelley Wilkinson
Address 7172 0
c/o- Dept Nutrition and Dietetics
Mater Health Services
Lvl 3, MCH
Raymond Terrace
South Brisbane
Queensland, 4101
Country 7172 0
Phone 7172 0
+61 7 3163 8585
Fax 7172 0
Email 7172 0

No information has been provided regarding IPD availability
Summary results
Have study results been published in a peer-reviewed journal?
Other publications
Have study results been made publicly available in another format?
Results – basic reporting
Results – plain English summary