Eligibility for referral at MUAC below 11.5 cm made no measurable difference on its own

Design

Prospective regression discontinuity analysis within a cluster-randomised trial

Population

65,554 children aged 6–59 months; 226 below MUAC 11.5 cm at least once

Primary outcome

MUAC at the next census and all-cause mortality

Effect

MUAC difference 0.21 cm (−0.22 to 0.65); mortality OR 0.95 (0.03 to 31.37)

In Nouna District, Burkina Faso, children aged 6 to 59 months were screened with mid-upper arm circumference twice a year within a community trial of azithromycin. Those below 11.5 cm were recommended for referral to a nutrition programme. Because children just above and just below the cut-off are otherwise alike, comparing them (a regression discontinuity design) estimates what eligibility for referral achieved. Treatment uptake was not recorded.

Of 65,554 children, 226 fell below the cut-off at least once. At the cut-off, arm circumference at the next census differed by 0.21 cm (95% CI −0.22 to 0.65), and the mortality odds ratio was 0.95 with an interval so wide (0.03 to 31) that it is uninformative.

This does not show that treating severe acute malnutrition is ineffective; it shows that a referral recommendation without a link to treatment did not detectably change outcomes near the threshold. The lesson travels to India's community screening, where referral to a nutrition rehabilitation centre is often where the pathway breaks: distance, cost and lost wages keep families away. The screening is only as good as the follow-through.

• Treat a MUAC below 11.5 cm as the start of a care pathway, not the end of a screening task.
• Confirm that the family has reached the nutrition centre or started treatment, rather than just issuing a referral.
• Ask about barriers to attending, such as distance, cost and lost wages, when making the referral.
• Consider community-based management where available for uncomplicated severe acute malnutrition.

Why it matters

Screening programmes count referrals, but children only benefit if the referral is completed.

Don't overread it

This tested eligibility for referral, not the effect of malnutrition treatment itself.

The statistics, in plain English

A regression discontinuity compares children just either side of a cut-off, who should be similar except for eligibility. The mortality interval from 0.03 to 31 is so wide that the study says nothing about deaths; the arm-circumference result is more precise but still compatible with a small benefit.

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