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Table 2 Frequency of dizziness descriptor and probability of endorsement of each item given latent class membership

From: Differential diagnosis of dizziness after a sports-related concussion based on descriptors and triggers: an observational study

   Probability of “yes” response given latent class (SE)
Question asked of the participants Yes, n (%) High symptoms Medium symptoms Low symptoms
Are you dizzy? 54 (63) .99 (02) .63 (.08) .27 (.10)
Do you feel like the room is spinning? 5 (6)
Do you feel like stationary objects are moving? 9 (10) .39 (.12) .00 (.00) .04 (.04)
Do you have imbalance or unsteadiness when standing (like you might fall or are swaying)? 43 (50) .98 (.04) .40 (.09) .24 (.10)
When you turn your head, does it seem like your eyes do not keep up?a 25 (30) .41 (.12) .39 (.08) .01 (.02)
Do you feel like you are floating? 3 (3)
Do you feel spacey? 26 (30) .39 (.12) .40 (.08) .01 (.04)
Do you feel like something is just “off”? 64 (74) .92 (.07) .91 (.05) .24 (.10)
Do you have a “fuzzy head”? 37 (43) .83 (.09) .42 (.08) .06 (.06)
Do you feel light-headed (like you might pass out)? 26 (30) .68 (.13) .25 (.07) .05 (.06)
Do you have difficulty concentrating or focusing? 67 (78) .96 (.05) .80 (.07) .56 (.11)
Do you have a “swimming” sensation in your head?b 5 (6)
Do you have motion sickness? 18 (21) .47 (.12) .14 (.06) .10 (.07)
Do you feel nauseous (like you might throw up)? 22 (26) .71 (.13) .16 (.06) .00 (.01)
Is the way you feel difficult to describe? 67 (78) .94 (.05) .88 (.05) .42 (.12)
  1. Three items were removed from the final model because the item response probabilities were not distinguishable between classes (i.e., the differences in item response probability between classes was less than 15 %)
  2. aMissing values
  3. b2 missing values