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Table 1 Characteristics of study participants

From: Extreme anorexia nervosa: medical findings, outcomes, and inferences from a retrospective cohort

  Cohort (N = 281) AN-R (N = 175) AN-BP (N = 106)   
Patient Characteristics N % N % N %   
Female 256 91 158 62 98 38   
Male 25 9 17 68 8 32   
Admitted from
 Home 219 78 128 58 91 42   
 Hospital transfer 37 13 29 78 8 22   
 Inpatient eating disorder program 23 8 17 74 6 26   
 Other 2 < 1 1 50 1 50   
Referral from outside Colorado 257 91 161 63 96 37   
  Meana SDa Meana SDa Meana SDa t-testb pvalue
Age 28 22–37 27 22–38 31 22–37 15,900 0.15
Length of hospitalization (days) 22 15–30 23 16–33 21 13–28 13,754 0.07
Percent of IBW
 Admission 57.7 5.5 57.2 5.5 58.4 5.4 1.75 0.08
 Nadir 57 6.2 56.5 6.1 57.9 6.5 1.81 0.07
 Discharge 69 7.4 67.7 6.2 71.2 8.7 3.61 < .001
 Change in %IBW 12 8.4 11.2 7.5 13.3 9.6 2.03 0.04
BMI (kg/m2)
 Admission 12.1 1.3 12 1.3 12.2 1.3 1.01 0.31
 Nadir 12 1.4 11.9 1.4 12.1 1.6 0.91 0.37
 Discharge 14.5 1.5 14.2 1.3 14.9 1.7 3.5 < .001
 Change in BMI 2.5 1.5 2.3 1.4 2.8 1.7 2.8 <.001
 Weekly weight gain (kg) 2 1.5 1.7 0.9 2.6 2.0 4.26 < .0001
Daily caloric intake (kcal)
 Admission 1457 249 1477 269 1424 209 −1.74 0.06
 Discharge 3175 762 3282 763 2996 728 −3.1 0.002
  1. AN-R Anorexia nervosa restricting subtype, AN-BP Anorexia nervosa binge-purge subtype, IBW Ideal body weight, BMI Body mass index
  2. aMedian and IQR for not normally distributed variables
  3. bMann-Whitney U test