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Table 2 Descriptive and psychometric FOGQsa data

From: Development and testing of a self administered version of the Freezing of Gait Questionnaire

   Total sample n = 225 Clinical sample n = 36 Postal survey sample n = 189
Item   Mean (SD) Corrected Item-total correlationsn = 214 Mean (SD) Corrected Item-total correlationsn = 35 Mean (SD) Corrected Item-total correlationsn = 179
1 "Walking during worst state" 1.6 (1.1) 2 missing 0.68 1.7 (1.2) 1 missing 0.87 1.6 (1.1) 1 missing 0.64
2 "Gait difficulties affecting daily activities and independence" 1.1 (1.1) 2 missing 0.68 1.2 (1.1) 1 missing 0.76 1.1 (1.2) 1 missing 0.68
3 "Feet getting glued to the floor" 1.1 (1.4) 1 3 missing 0.83 1.7 (1.4) 0.82 1.0 (1.4) 2 missing 0.84
4 "Duration of longest freezing episode" 0.87 (1.3) 7 missing 0.89 1.6 (1.6) 0.91 0.73 (1.1) 7 missing 0.90
5 "Duration of typical start hesitation" 0.76 (1.1) 6 missing 0.88 1.2 (1.4) 0.85 0.67 (1.1) 6 missing 0.89
6 "Duration of typical turning hesitation" 0.76 (1.1) 5 missing 0.83 1.1 (1.4) 0.78 0.68 (1.1) 5 missing 0.85
   Total score n = 214 Total score n = 35 Total score n = 179
  Mean (SD) 6.1 (6.2)   8.6 (7.2)   5.6 (5.9)  
  Median, q1-q3 4.0, 1.0-4.0   8.0, 2.0-14.0   4.0, 1.0-9.0  
  Min-max 0-22   0-22   0-22  
  % scoring minimum (0)/maximum (24) 19/0   17/0   20/0  
  Reliability, Cronbach's alpha (95% CI) 0.93 (0.91-0.94) 0.94 (0.90-0.97) 0.93 (0.91-0.94)
  1. FOGQsa: Freezing of Gait Questionnaire, self administered version. Each item is scored between 0-4, and the total score thus ranges between 0-24. Higher scores denote more severe FOG.
  2. Some participants left certain items blank. Total scores could therefore be computed for 214 out of the 225 (95%).
  3. 1 On item 3, 126 scored 0, i.e. they never experienced freezing episodes, whereas 96 out of the 214 (45%) scored at least 1 and could be defined as "freezers".
  4. Out of the 96 reporting freezing episodes, 51 did so "often- about once a day" and 11 "always- whenever walking".