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Mean postero-anterior (PA) spine bone mineral density (BMD) Z-scores of four groups: 1) atypical AN with prior low weight (defined as BMI <18.5kg/m2) and history of amenorrhea, 2) atypical AN with prior low weight or history of amenorrhea, 3) atypical AN with no history of low weight or amenorrhea, and 4) healthy women. Mean ± SEM. * p ≤0.05.
