Hussamy 2017.

Methods	Study design: randomised controlled trial Ethics and informed consent: not reported Sample size calculation: yes Follow‐up period: not stated ITT analysis: yes Funding: not stated
Participants	Location: Texas, USA Intervention group: n = 222control group: n = 219 Mean age: not reported Inclusion criteria: women with class III obesity (BMI > 40 kg/m²) undergoing caesarean delivery Exclusion criteria: women on anticoagulation, with HIV infection, sensitive skin disorders, or silver or acrylic allergies
Interventions	Aim/s: to compare the efficacy of closed incision negative pressure therapy (ciNPT) with a standard surgical dressing in the prevention of postoperative wound morbidity in women with class III obesity undergoing caesarean delivery Group 1 (NPWT) intervention: a ciNPT dressing at time of caesarean Group 2 (control) intervention: a standard surgical dressing Study date/s: January 2015 to July 2016 (18 months)
Outcomes	wound morbidity including wound disruption requiring the use of antimicrobials, prolonged postoperative hospitalisation, hospital readmission, or reoperation within 30 days of delivery Validity of measure/s: not stated Time points: not stated
Notes	Only the abstract was available.
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Not stated
Allocation concealment (selection bias)	Unclear risk	Not stated
Blinding of participants and personnel (performance bias) All outcomes	Low risk	Evidence for participants: not possible Comment: unlikely to affect outcomes Evidence for personnel: not possible Comment: unlikely to affect outcomes
Blinding of outcome assessment (detection bias) All outcomes	Unclear risk	Not stated
Incomplete outcome data (attrition bias) All outcomes	Low risk	441 participants were enrolled and analysed.
Selective reporting (reporting bias)	Low risk	Expected outcomes were reported in the abstract.
Other bias	Unclear risk	Not stated