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Table 6 Total and subscale score of English and Chinese MFSI-SF versions and measurement equivalence between the two versions

From: Psychometric properties and measurement equivalence of the Multidimensional Fatigue Syndrome Inventory- Short Form (MFSI-SF) amongst breast cancer and lymphoma patients in Singapore

(Theoretical Score Range) Mean ± S.D. English vs. Chinese
Total (N = 236)e English-version (n = 155) Chinese-version (n = 81) Equivalence margina
(±0.25 S.D.)
Equivalence marginb
(±0.5 S.D.)
95% CI of Unadjusted difference 95% CI of Adjusted differencec
Total MFSI-SF score 0.720 (19.06) 1.56 (20.32) − 0.889 (16.36) ± 4.59 ± 9.17 − 2.450 (− 7.599 to 2.698) 0.095 (− 1.512 to 0.097)
 General 4.34 (4.51) 4.87 (4.74) 3.33 (3.84) ± 1.07 ± 2.15 − 1.538 (− 2.742 to − 0.333) − 0.009 (− 1.327 to 1.148)
 Physical 3.88 (4.11) 4.22 (4.51) 3.22 (3.15) ± 0.96 ± 1.91 − 0.997 (− 2.103 to 0.109) 0.023 (− 0.967 to 1.357)
 Emotional 3.21 (4.25) 3.34 (4.46) 2.96 (3.83) ± 1.04 ± 2.07 − 0.373 (− 1.522 to 0.777) 0.096 (−  0.423 to 2.142)d
 Mental 3.00 (3.91) 3.32 (4.28) 2.38 (3.01) ± 0.91 ± 1.82 − 0.933 (− 1.985 to 0.118) − 0.016 (− 1.274 to 1.017)
 Vigour 13.70 (6.48) 13.18 (6.61) 12.79 (6.14) ± 1.59 ±3.19 − 1.391 (− 3.134 to 0.353) − 0.217 (− 4.922 to − 0.991)d
  1. MFSI-SF Multidimensional Fatigue Symptom Inventory - Short Form
  2. Equivalence was assessed by comparing 95% CI of the adjusted difference to the equivalence margin (±0.5 S.D.)
  3. aThe equivalence margin is the simple average of the standard deviation of the Chinese and English scores multiplied by 0.25
  4. bThe equivalence margin is the simple average of the standard deviation of the Chinese and English scores multiplied by 0.50
  5. cMean difference between the English and Chinese version was adjusted for relevant variables that showed statistical significant differences between the English and Chinese version of MFSI-SF (Table 1 and Additional file 1: Table S3): age, race (Chinese vs Non-Chinese), education (low education vs high education), ECOG status, EORTC nausea and vomiting symptom, EORTC dyspnoea item
  6. d95% CI of the adjusted difference exceeded the equivalence margin threshold (±0.5 S.D.)
  7. eData for ECOG was missing for 10 patients