Table 1 Participant characteristics and dose of family-based therapy (FBT)

Age at start in years, mean (SD, range)

14.3 (1.6, 10.3–17.5)

14.4 (1.6, 10.3–17.5)

14.2 (1.6, 11–16.8)

14.8 (1.0, 13.0–16.5)

ns

Diagnosis of typical anorexia nervosa (F50.0)^b, N (%)

97 (61.8)

52 (57.8)

40 (72.7)

5 (41.7)

ns

Diagnosis of atypical anorexia nervosa (F50.1)^b, N (%)

60 (38.2)

38 (42.2)

15 (27.3)

7 (58.3)

ns

Males N (%) / females N (%)

13 (8.3)/144 (91.7)

10 (11.1)/80 (88.9)

≤ 3 males

0 / 12 (100%)

ns

Comorbid psychiatric diagnosis, N (%)

42 (26.8))

20 (22.2)

20 (36.4)

≤ 3

ns

Parents living together, N (%)

117 (74.5)

65 (72.2)

45 (81.8)

7 (58.3)

ns

Intake percent of EBW, mean (SD, range)

84.2 (9.5, 64.0–109.5)

85.4 (9.1, 68.1–109.5)

81.9 (9.3, 64.0–101.0)

85.3 (11.9, 68.9–108.8)

Recovery group > prolonged group, p = .027

Intake percent of IEBW, mean (SD, range)

83.4 (8.4, 64.0–106.8)

85.2 (8.7, 67.2–106.8)

80.2 (7.0, 64.0–97.3)

85.5 (7.9, 75.7–97.5)

Recovery group > prolonged group, p = .001

Intake weight ≦ 85% of IEBW, N (%)

91 (58.0)

42 (46.7)

42 (76.4)

7 (58.3)

Recovery group > prolonged group, p < .0001

Intake weight ≦ 70% of IEBW, N (%)

4 (2.5)

≤ 3

≤ 3

0

Intake resting heart rate < 50 beat/minute at intake, N (valid %)

18 (12.2)

9 (10.0)

8 (14.5)

≤ 3

ns

Intake EDE-global score, mean (SD, range)

2.8 (1.3, 0.1–5.4)

2.8 (1.3, 0.4–5.0)

2.8 (1.3, 0.2–5.4)

2.8 (1.7, 0.1–4.5)

ns

Number of sessions of FBT first 12 months, mean (SD, range)

20 (9, 2–46)

15 (6, 2–30)

27 (8, 7–41)^c

19 (10, 9–46)

Completed FBT with 20 or fewer sessions, N (%)

76 (48.4)

76 (84.4)

n/a

n/a

Duration of treatment (FBT, plus potential time spent in intensifications) months, mean (SD, range)

10 (5, 1–27)

7.4 (2.8, 0.5–12.8)

16.7 (3.8, 13–27)^d

7.3 (3.7, 1.9–12.5)

FBT phase 2 at 12 months, N (%)

n/a

21 (38.2)

n/a

FBT phase 3 at 12 months, N (%)

n/a

23 (41.8)

n/a