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Table 2 Descriptive statistics for each patient reported outcome measure used in the 6 month follow up post randomisation in the OSCAR trial

From: Psychometric properties of Patient Reported Outcome Measures (PROMs) in patients diagnosed with Acute Respiratory Distress Syndrome (ARDS)

  Range N Mean SD Response rates Floor effects Ceiling effects
EQ-5D-3 L (Utility) −0.594 to 1 234 0.60 0.36 95.29 % 0.00 % 19.73 %
SF-6D (Utility) 0.345 to 1 218 0.66 0.16 93.16 % 0.92 % 0.92 %
SF-12 PCS 0 to 100 209 36.88 12.32 89.32 % 0.00 % 0.00 %
SF-12 MCS 0 to 100 209 43.43 13.30 89.32 % 0.00 % 0.00 %
SGRQ Symptoms Score 0 to 100 221 33.71 27.89 94.44 % 1.36 % 1.36 %
SGRQ Activity Score 0 to 100 193 46.04 31.80 82.47 % 7.77 % 7.77 %
SGRQ Impact Score 0 to 100 194 22.13 22.42 82.90 % 0.00 % 0.00 %
SGRQ Total Score 0 to 100 175 32.08 24.18 74.79 % 0.00 % 0.00 %
  1. Scores or Utility Values of participants which could not be calculated due to missing items were not included within the analysis
  2. N stands for the sample size. SD denotes the standard deviation. CI is abbreviated for confidence intervals
  3. Floor effects is the proportion of patients in the lowest health state possible and ceiling effects is the proportion of patients in the highest health state poss
  4. EQ-5D-3 L is anchored at -0.594 for worst possible health and 1 for best possible health
  5. SF-6D is anchored at 0.345 for worst possible health and 1 for best possible health
  6. SF-12 PCS & MCS scores are anchored at 0 for worst possible health and 1 for best possible health
  7. SGRQ scores are anchored at 100 for worst possible health and 0 for best possible health
  8. The EQ-5D-3 L and SF-12 was assessed in terms of complete responses for all questions
  9. The SF-6D was regarded complete if there was sufficient items to calculate a score
  10. The SGRQ was assessed by calculating if more than 24 % of the items were missing or not answered, then a total score could not be calculated