text: follow-up data at each time point were considered for pre- 
  diction analyses (n = 246, 55.9%). 
  
  reproduced in an independent sample [42, 43]. With 18 
  potential predictors, a sample of n = 180 reporting 
  healthcare utilization at follow-up would be sufficient 
  for the proposed analyses. However, this estimate is con- 
  servative. Other methods for determining sample size 
  for prediction analyses suggest an overall sample size of 
  N > 50 + 8*m (where m = number of independent vari- 
  ables) [44] or N > 104 + number of independent predic- 
  tors [45, 46]. For these less conservative estimates, the 
  projected study sample size is sufficient for the proposed 
  analyses. 
  
  Overall, 43.1% (n = 106/246) of those with complete 
  follow-up data utilized at least one healthcare service 
  following the physical therapy episode. Distribution of 
  utilization for specific services is provided in Table 4. 
  For multivariate analyses, all VIFs were less than 10 and 
  tolerance values greater than 0.1 suggesting no signifi- 
  cant multicollinearity among independent variables. 