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Table 4 Known-groups analysis of ISM-SAF scores based on concurrent assessments administered at C4D1

From: Psychometric evaluation of the Indolent Systemic Mastocytosis Symptom Assessment Form (ISM-SAF) in a phase 2 clinical study

ISM-SAF domain

Known group

N

Mean (SD)

Median

p value*

PGIS

Gastrointestinal Symptom Score (0–30)

Absent/Minimal

12

4.3 (3.3)

4.2

0.009

Moderate

11

9.5 (2.9)

9.4

Severe/Very Severe

11

9.7 (6.5)

9.4

Skin Symptom Score (0–30)

Absent/Minimal

12

8.1 (4.0)

8.5

< 0.001

Moderate

11

12.6 (6.0)

10.9

Severe/Very Severe

11

18.3 (6.5)

20.4

Total Symptom Score (0–110)

Absent/Minimal

12

27.1 (10.2)

26.8

< 0.001

Moderate

11

50.4 (12.1)

50.9

Severe/Very Severe

11

55.2 (15.1)

55.9

EQ-5D-5L VAS

Gastrointestinal Symptom Score (0–30)

Severe (1st tertile)

11

11.0 (5.6)

10.6

0.028

Moderate (2nd tertile)

12

6.5 (5.0)

6.2

Mild (3rd tertile)

11

5.8 (2.9)

5.1

Skin Symptom Score (0–30)

Severe (1st tertile)

11

16.2 (5.9)

19.0

0.144

Moderate (2nd tertile)

12

11.8 (7.9)

9.4

Mild (3rd tertile)

11

10.8 (5.9)

9.9

Total Symptom Score (0–110)

Severe (1st tertile)

11

55.5 (15.7)

55.9

0.003

Moderate (2nd tertile)

12

44.0 (16.1)

44.1

Mild (3rd tertile)

11

31.5 (13.0)

28.1

MC-QoL Symptom

Gastrointestinal Symptom Score (0–30)

Mild (1st tertile)

10

4.7 (3.6)

4.2

0.014

Moderate (2nd tertile)

12

7.3 (3.7)

7.6

Severe (3rd tertile)

12

10.7 (5.8)

11.1

Skin Symptom Score (0–30)

Mild (1st tertile)

10

9.7 (7.1)

9.0

0.104

Moderate (2nd tertile)

12

12.5 (6.3)

10.4

Severe (3rd tertile)

12

15.9 (6.5)

19.3

Total Symptom Score (0–110)

Mild (1st tertile)

10

29.5 (10.6)

27.6

< 0.001

Moderate (2nd tertile)

12

43.4 (16.4)

46.3

Severe (3rd tertile)

12

55.8 (14.8)

55.7

SF-12v2® PCS

Gastrointestinal Symptom Score (0–30)

Severe (1st tertile)

11

10.6 (3.2)

10.6

0.032

Moderate (2nd tertile)

12

7.6 (6.5)

5.7

Mild (3rd tertile)

11

5.0 (3.3)

4.5

Skin Symptom Score (0–30)

Severe (1st tertile)

11

13.8 (7.1)

15.0

0.366

Moderate (2nd tertile)

12

14.2 (5.7)

13.0

Mild (3rd tertile)

11

10.4 (7.7)

9.6

Total Symptom Score (0–110)

Severe (1st tertile)

11

53.4 (10.8)

55.6

0.002

Moderate (2nd tertile)

12

47.8 (19.6)

45.0

Mild (3rd tertile)

11

29.4 (11.4)

27.1

  1. C#D# cycle number, day number, EQ-5D-5L Five-level EQ-5D, ISM-SAF Indolent Systemic Mastocytosis Symptom Assessment Form, MC-QoL Mastocytosis Quality of Life Questionnaire, PCS Physical Component Summary, PGIS Patient Global Impression of Severity, SD standard deviation, VAS visual analogue scale
  2. *p values from are from one-way analysis of variance (ANOVA) testing of mean score differences between groups