Table 1.
| Table 1a. Classifications of weight parameters and their cut-offs used to diagnose low weight in patients with AN
| ||||||||
|---|---|---|---|---|---|---|---|---|
| Absolute BMI kg/m2 Reference | BMI percentile Reference | %mBMI | %EBW-Ht | |||||
| Low-weight cut-offs | ≤17.5 | >17.5 | ≤5 | >5 | ≤85 | >85 | ≤85 | >85 |
| DSM-IV-TR | DSM-5 | |||||||
|
| ||||||||
| ≤18.5 | >18.5 | ≤10 | >10 | ≤90 | >90 | ≤90 | >90 | |
| WHO | WHO | |||||||
| 1b. Classifications of severity measures for low weight
| ||||||
|---|---|---|---|---|---|---|
| Absolute BMI (WHO and DSM-5) | %mBMI* (SAHM) | BMI z-score (SAHM) | ||||
| Low-weight severity categories | <15 | Extreme | <70% | Severe | ≤−3 | Severe |
| 15–15.9 | Severe | 70%–79% | Moderate | −2.9 to −2 | Moderate | |
| 16–16.9 | Moderate | 80%–90% | Mild | −1.9 to −1 | Mild | |
| ≥17 | Mild | >90% | - | >−1 | - | |
%mBMI: Percent median BMI for age
%EBW-Ht: Percent expected body weight for height
WHO: World Health Organization
SAHM: Society of Adolescent Health and Medicine
*
Because so few patients were classified as severe using %mBMI (n=8), we grouped those identified as moderate and severe together for analyses. We chose not to eliminate these eight participants as this would have led to a reduction in the number of participants in the severe/extreme category for other severity systems, and resulted in an underrepresentation of the severity of low BMD using these other systems.