Table 5 MFI, SF-36 and Symptom Inventory Criteria for CFS - Comparison of CFS Cases identified with Two Methods of Applying the 1994 Case Definition
CFS Classification (non-overlapping categories) | |||
|---|---|---|---|
Criteria | Both Methods | Method 1 Only | Method 2 Only |
(n=44; M1/M2) | (n=15; only M1) | (n=27; only M2) | |
(1) MFI Criterion (one of two cutoffs) | |||
(i) General Fatigue ≥ 13* | 42 (95.45 %) | 9 (60.00 %) | 26 (96.30 %) |
(ii) Reduced Activity ≥ 10 | 34 (77.27 %) | 7 (46.67 %) | 18 (66.67 %) |
Met at least one* | 44 (100 %) | 11 (73.33 %) | 27 (100 %) |
(2) SF-36 Criterion (one of four cutoffs) | |||
(iii) Physical Functioning ≤ 70* | 32 (72.73 %) | 3 (20.00 %) | 14 (51.85 %) |
(iv) Role Physical ≤ 50* | 33 (75.00 %) | 4 (26.67 %) | 19 (70.37 %) |
(v) Social Functioning ≤ 75* | 42 (95.45 %) | 11 (73.33 %) | 25 (92.59 %) |
(vi) Role Emotional ≤ 66.67 | 29 (65.91 %) | 6 (40.00 %) | 11 (40.74 %) |
Met at least one* | 44 (100 %) | 11 (73.33 %) | 27 (100 %) |
(3) CDC Symptom Criterion (Both cutoffs) | |||
(vii) ≥ 4 CFS Symptoms lasting ≥ 6 months | 44 (100 %) | 15 (100 %) | 27 (100 %) |
(viii) Summary Score ≥ 25* | 44 (100 %) | 5 (33.33 %) | 27 (100 %) |
Met both | 44 (100 %) | 5 (33.33 %) | 27 (100 %) |
Meet all criteria (1),(2), (3) | 44 (100 %) | 0 | 27 (100 %) |
Meets SF-36 Criterion based on Role Emotional Alone | 0 | 0 | 0 |
Total number of criteria (i)-(viii) met (8 maximum) | |||
1 | 1 (6.67 %) | ||
2 | 1 (6.67 %) | ||
3 | 3 (20.00 %) | ||
4 | 2 (4.55 %) | 5 (33.33 %) | 1 (3.70 %) |
5 | 7 (15.91 %) | 3 (20.00 %) | 7 (25.93 %) |
6 | 4 (9.09 %) | 1 (6.67 %) | 8 (29.63 %) |
7 | 15 (34.09 %) | 1 (6.67 %) | 8 (29.63 %) |
8 | 16 (36.36 %) | 0 | 3 (11.11 %) |